First Look: 2011 Duramax Diesel V-8 Engine

First Look: 2011 Duramax Diesel V-8 Engine

We’ve shown you spy photos and shared what our sources have told us, but now GM has pulled back more of the veil surrounding its next-generation heavy-duty Duramax diesel V-8 engine program. The illumination happened during a future product briefing at GM’s Milford Proving Grounds.

Why the need for a new round of updates to the Duramax just three years after the current engines arrived? Come Jan. 1, 2010, all new diesel-powered vehicles will have to meet tougher federal diesel emission standards that will reduce allowable nitrogen oxide levels by 90 percent from today, 96 percent from 1994 levels.

NOx is a major air pollutant that contributes to smog, asthma, and respiratory and heart diseases. It's a byproduct of diesel’s high combustion temperatures.

The new Duramax diesel engines are built to meet new clean-air regulations, plus they feature other key improvements in technology and capability. Like today’s Duramax, the Isuzu-GM joint venture engine will continue to be available in two versions.

“The new Duramax diesels are based on the same engines that have been around since 2001,” said Gary Arvan, a GM diesel powertrain engineering chief. “The 2500 and 3500 Chevrolet Silverado and GMC Sierra HD pickups receive the high-power LML motor [replacing the 2007-10 LMM], while the 2500 and 3500 heavy-duty vans receive the lower-rated LGH engine [also replacing the LMM]. Both have iron blocks, aluminum cylinder heads, and their [6.6-liter] bore and stroke are unchanged.”

LML 6.6-liter V-8 Duramax Diesel

The LML will be paired with an Allison six-speed transmission while the LGH will be mated to GM’s in-house 6L90 six-speed gearbox, which is also matched with the 6.0-liter V-8 gas engine.

The two biggest technical changes Arvan shared details about are the Duramax’s all-new selective catalytic reduction and its enhanced exhaust gas recirculation systems -- which are needed to scrub NOx down to no more than .2 grams per horsepower/hour -- as well as its approved use of B20 biodiesel. That’s 80 percent ultra-low-sulfur diesel and 20 percent biodiesel.

NOx selective catalytic reduction uses diesel exhaust fluid. The urea-based solution (32.5 percent industrial urea and 67.5 percent deionized water) is held in a 5.5-gallon storage tank and injected as a fine mist into the Duramax’s hot exhaust gases. The heat turns the urea into ammonia that -- when combined with a special catalytic converter -- breaks the NOx down into harmless nitrogen gas and water vapor.

The exhaust fluid refill point for the HD pickups is mounted under the hood of the engine, while the vans’ is positioned next to the fuel door on the side of the vehicle. The tank is mounted on the side of the driver-side frame rail.

Arvan says diesel exhaust fluid refill intervals will vary depending on duty cycle. Some customers will only have to refill during routing maintenance, such as when the oil is changed, while others will have to top off the tank sooner.

DEF fill port on Chevy Van

“If they’re towing frequently, they’ll [likely] have to fill up with DEF again sooner,” Arvan said.

To ensure that the exhaust fluid tank is refilled, Duramax-equipped trucks will warn the driver when the fluid is down to a 1,000-mile range. A series of start-up warnings -- including lights, chimes and messages -- will become more frequent until the tank is empty. If the driver continues to operate the truck with a dry tank, after a final warning and restart the truck will only operate in a “limp-home” mode that limits speed to just 5 mph until the tank is refilled.

The selective catalytic reduction and diesel-particulate filter systems depend on a diesel oxidation catalyst that’s positioned downstream, behind the engine, to start the NOx and soot-scrubbing processes. The catalyst requires high temperatures to perform. Those temperatures are achieved on-demand by the addition of a new fuel injector that’s been positioned directly behind the exhaust outlet of the Duramax’s variable-geometry turbo instead of using the engine’s eight existing in-cylinder injectors. Fuel is squirted into the hot exhaust and burns, quickly raising temperatures in the catalysts.

The LML and LGH also make greater use of exhaust gas recirculation across the Duramax’s power band than did the LMM Duramax. The system recirculates a portion of the engine's exhaust back into the engine at a lower temperature. The cooled gases have a higher heat capacity and contain less oxygen than air, lowering combustion temperatures and reducing the formation of NOx. Exhuast gas recirculation is prevalent in today’s clean-diesel engines to reduce NOx, but it’s not efficient enough in its current form to meet 2010 emissions levels in GM’s trucks, hence the use of selective catalytic reduction also.

Power ratings play a role in how much emissions equipment is needed.

“We’ve improved the performance of the Duramax in the van to 250 horsepower and 500 pounds-feet of torque from today’s 250 hp and 460 pounds feet,” Arvan said. “We aren’t prepared to talk about the new power figures for the heavy-duty trucks yet, but we won’t let the new emissions regulations bring us down [in power]. We’ll produce at least the 360 hp and 660 pounds-feet of torque [with the LML] that we make with today’s engine.”

DEF tank

We think there will be a significant power bump when the final numbers are revealed.

The LGH Duramax has a smaller exhaust gas recirculation cooler than the LML motor because of its lower power ratings. It also has a smaller radiator and cooling system.

Efficiency improvements to the recirculation system include new separate cold and hot circuits that allow exhaust gas to recirculate immediately after engine startup, when engine temperatures are still relatively cool and when the engine is idling.

In addition to burning cleaner, the LML/LGH Duramax can also burn greener. It’s certified to burn B20 biodiesel, up from the LMM’s B5 rating.

“We made a lot of enhancements to make sure the new Duramax is robust with biodiesel,” Arvan said. “The engine uses our latest-generation fuel filter that includes a coalescing filter to trap any water that could be present in the fuel. The downstream injector [behind the exhaust] for diesel particulate filter regeneration means we also won’t have a worry of oil dilution with B20 fuel from in-engine post injection [like is used on the LMM diesel]. There’s also additional heating to the fuel circuit so the filter won’t get plugged from old [B20] fuel gelling or waxing.”

Another big change to the Duramax’s fuel system is the first-time use in the Duramax of piezo electric injectors, which can react faster to fuel demands than the old solenoid injectors could. Fuel pressures are up from 1,800 bar (26,000 psi) to 2,000 bar (29,000 psi) for improved fuel atomization and combustion control. The piezo injectors run on an all-electric circuit in the engine, which helps explains the high-voltage cable we’ve seen in spy photos of the engine.

2011 Duramax-powered Chevy Van

The new Duramax keeps the same Garrett-supplied single turbo setup of the LMM Duramax, though the compressor and turbine wheel diameters and blade trims have changed. The turbo also uses the same “boreless” compressor wheel.

The Duramax also continues to use a conventional gray iron engine block, but it’s been structurally enhanced around the lower skirt to help reduce noise, vibration and harshness. Combined with a new pre-combustion fuel-injection scheme that injects two pilot injections into the cylinder before the main injection, noise levels have been reduced up to 50 percent in the 1,500-1,600 rpm peak torque operating range.

“We focused on getting NVH down in the heaviest driving points,” Arvan said.

We briefly drove a 15-passenger Chevrolet Express 2500 van with the LGH Duramax diesel under its hood. While we weren’t able to do much more than a few quick starts and stops and some city-driving route simulations, we could immediately tell the engine was much quieter than the current LMM Duramax. Arvan said the van we drove was pre-production and only about three-quarters of the way through finalizing its engine calibrations.

Another change is reduced engine-idle speed. Arvan says it’s been reduced from 720 rpm to 640 rpm in the pickups. The van is able to idle at only 600 rpm.

All new engine controllers are needed to manage the sophisticated fuel and emissions system. Arvan says they have twice the number of calibrations as the previous LMM diesel to help the engine run as efficiently as possible across the widest range of operating conditions.

The oil pump is slightly bigger, plus there have been some minor changes to the crankshaft and pistons. Aluminum heads -- a Duramax hallmark -- remain. Engine weight is said to be comparable to the LMM engine.

2011 Chevrolet Silverado 3500 mule
2011 Chevrolet Silverado 3500 mule by Chris Doane for Brenda Priddy & Co.

Arvan also says fuel economy will remain the same -- a key concern of any new diesel owner given the emphasis on clean emissions over operating efficiency.

What isn’t GM yet sharing about the 2011 Duramax? We still don’t know final power ratings for the HD pickups, and there are still a few surprises for a later date -- like perhaps an integrated exhaust brake.

“We’re working on some things in that area [exhaust brake integration],” Arvan said. “We’ll see. It’s part of future discussions.”

We’re definitely looking forward to those conversations and spending some serious time testing the new LML Duramax clean diesel.

Comments

The EPA does not enforce emissions rules on vehicle owners, except for a few token sting operations 3 decades ago. They MIGHT go after a shop, if they find out about it and they have the resources. And the SEMA-member chip people who advertise in the truck mags simply don't make illegal products.

I can't stand eco-freaks, emissions inspections or government regulations, but I am forced to agree with Gale Banks and some of the posters here that black smoke is not the hot ticket. Nor is loud exhaust. There was a time when that kind of thing was necessary to make power, but that's ancient history. Why would you want a loud, smoky truck, except to deliberately alienate people? Then they will write their legislators and we will get exactly the laws we don't want, laws that may affect even legitimate performance upgrades.

I resented the emissions regs of the 70s, which killed the musclecar and resulted in gutless-wonder engines that could barely get away from a light without stalling, even when brand new. I wanted to go back to '60s engines then, but not now. Why would I, when I can by a Cadillac with 554 HP that is almost zero emission, gets decent fuel economy, and idles smoothly? Ditto for trucks.

But is anyone disagrees, I won't be turning them into the authorities. It's none of my business.

This is like listening to my children fighting. The air needs to be as clean as it was before we messed it up in the late 1890's. Diesels have come a long way being cleaner and quieter and need to be appreciated for the effort. As for being ugly, wait until the actual model comes out before you cry like a little girl who didn't get her lollipop! The VP of Engine developement for GM issued a challange to Ford for a tug of war against their 2011 F-350 and the new 6.7 Diesel they made. Ford is expected to announce 400 hp and 750 ft lb torque with this engine. Now, I except GM to have about the same to issue such a challenge.

chevrolt still has not change the front fender well to fit bigger tires it has been a pain for ever I wonder if any of the engineers at chevrolet have ever drove a truck. the Five miles an hour should be changed just after the first law suit of somebody being run over because of it

Has anyone heard what the price will be for the new diesel package? A dealer told me it would be approx 6k higher than the 2009/2010 year. That would mean almost 15k for the engine with tranny?

chevy is the best

I drive a big green Ford 3500 dually.I got it 2 months ago and I love it!!It has a 2008 bed on a 2004 chassis,I also have a Wilson 5k cb antenna on the roof:)I live in Arnaudville,louisina,my address is
John Brady Myers 467 Halfway House rd.
Arnaudville,La. 70512 is my zip..Please send your opinions about diesel technology as i am interested in starting a public awareness campaign to educate everyday folks about the advantages of diesel truck technologies.All it takes is a self addressed envelope to become eligible to win a 10,000 dollar DTC Inc. shopping spree[this prize will be honored for 180 days by all of our diesel racing sponsors]]......don't miss out,we will only be sponsoring one cash giveaway so don't let this oppurtunity pass you by!!Thanks,Johnny Boy

I was told by a Chevy dealer all these lovely additions to the DMAX are going to cost the consumer an additional $5K on top of the $7.2K for the deisel engine and $1.2K for the transmission. The question I have, is why would I want to pay an additional $5K for a 2011 when I can still buy the 2010? EPA, you want to save the environment, then you pay for it! All this is going to do is hurt sales for the big three and we, the American tax payers, will be asked to bail them out again.

When I bought my 2007 classic GMC 2500HD as the new generation 2007s LMM was coming out in march '07, I only bought it cause they were on sale to make way for the new. Little did I know that the LBZ engine in that '07 was the last of the no emmission duramax's. I never thought it would get so complicated. the newer LML will be difficult to modify with aftermarket to eliminate the emmission controls. In the magazine Maxx Torque there is an article that GM will no longer honor the duramax warranty if the engine or the programming is modified, so is it worth it to loose the 5yr/100k mile protection? I guess it depends on how deep your pockets are.

Screw the enviroment..leave our trucks alone!!!!!!!!!!!

I got a 2006 F 250 lifted has a superchips just to be able to have the speedo right/ shift points right and a possible power gain cause i do have a 8 inch lift and 37'' tires. as far as making vehicles get better fuel mileage sweet. but to spend more money that we are going to have to pay for by the cost of the vehicle or in gas taxes is unreasonable. as far as the black smoke thing. ya its kinda cool to see the smoke and the horse power and have fun with our vehicles, because it is a huge investment in all our lives, but just like when i go dirtbike riding and guys are racing down the street instead of riding on the proper trails. makes it harder to keep those ORV parks open for the people that like to spend the weekend in the forest. it makes the price of our tabs for our dirtbikes quads and any other ORV vehicle go up because we need extra patrol to keep the Yahoos from doing illegal dumb things. so if you want diesels to get more hp less emission standard and have more fun stop making a bad vision of us. of course with the new president anything we do is going to be in vein away because he doesn't care about anything until we are all in a little geo's or on buses....
thats my 2 cents.
James

The urea will be sold in a jug at damn near all fuel stations. And if you report someone for blowing smoke than you need to get your priorities straight. Deisels are already cleaner than gas engines.

I've heard some nice things about these new duramax's being more powerful than thier predecessors, but like the guy a few blogs above me, that i've heard that these cant run in colder climates like North and South Dakota and Montanna and Minnesota etc. and like the other guy above me, im not one for black smoke but i absolutely LOVE the sound of a diesel, ps for the idiot that put that GM had a 6.5L in 1985, your wrong dude, that engine didn't début until 1995 or 6 and even the engine your talking about in 85 (which was GM's 6.2L) had way more hp than 185, so learn your facts before shootin your mouth off dumbass, so anywho im not completely sold on these new diesels cuz you cant even here them! what a waste of money, when i buy a new pickup, which is worth 40 or 50 grand (depending on what you get) why would someone wanna stick MORE MONEY INTO A BRAND NEW PICKUP!!!!!!!!!!!!!!!!

I bought an 05 2500 Duramax new and it has 270,000 miles on it (430,000 kms) Anyone know the life of these engines? Thinking its time to buy a new truck but jeez... this emissions crap is scary! Let alone, the price of a new truck nowadays... I'm getting about 11 - 12 MPG pulling a trailer with my Duramax. I'm wondering if I should buy the last of the 2010's unchanged (Urea stuff) or try a New truck? I'm not a Ford person but I took an "11" F350 for a couple test drives and that truck has POWER! Anyway, how many miles should I expect from my 2005 Duramax? I take good care of it;;; regular oil changes, fuel filter changes, stored inside etc. And, how are they going to keep the Urea from freezing? I live where it's BLOODY Cold!

Everyone who is complaining about the urea is damn lazy. Stop complaining every diesel should be taken care of: which means you have to do preventative maintenance (filling a urea is just one more small thing). I will buy this truck because I take care of my things. When taken care of, Chevy's last longer than Ford or Dodge. This truck will also be the biggest powerhouse in comparison. This new truck is unbelievable. Btw diesels actually do not pollute more than gassers. theres several articles and studies done on this. Read them if anyone needs proof.

cummins all the way duramax is quiet, power"choke" is just a strait up horrible diesel motor and the only problem with cummins is the transmission.... terrible tranny i have to say ford an chevy trannys are better than dodge but doge is the best motor out there

I have to say after reading all the comments, I do believe things have gotten out of hand with all the emissions controls the government is impossing. these are all regulations invented by civil servants that have no idea where their paycheck comes from.

It comes from private industry which they are destroying. How much damage and pollution was caused by the recent volcano eruption in comparison to diesel emissions. there isnt any.

The aftermarket parts industry is a huge source of revenue for the automotive industry. It creates jobs and tax revenue. We are all ready experiencing private businesses failing while the civil servants refuse to let anyone go or reduce their overhead.

a question arose about the rear heater; according to what a read at gmc's site today it will be fired by diesel but that's all they will say. The great gm god in engineer heaven is the only one who knows how this thing works. but if I had to make the guess of my life; I'd bet that it works off the exhaust system which means that it wont work with the engine not running.

Darn that pesky government intervention! I want my diesel to blow enough smoke and oxides of nitrogen to give every child in America asthma or some other medical ailment. Why should I pay a penny more per mile for everyone in North America to be healthier? The longer people live, the more they will drain social security. I'm going to roast some bald eagles over the tires that I burn in my front yard, just to prove that in America we should be free to do what we want, regardless of the consequences. Right?

...and why can't I dump my oil down the storm drains anymore? Why can't I dump mercury in the back yard next to my neighbor's well? Is this what you call progress? The government is infringing upon my right to make others sick!

wow, more junk to contend with. just more stuff to go wrong. like the Shuttle. ugly fuel tanks that stick out the bottom and the dealers will want about $50 K for that iron. Forget it, no more diesels for me esp when they get crappy fuel mileage. TS

ok... diesels are clean, that black smoke you see coming from them is burnt diesel fuel. yeah it may be black but still the process from where it goes from a golden ultra low sulfur color to black smoke makes it cleaner for the air, which means engine exhaust will become less noxious, in terms still way better for us than regular gasoline. and yes we will keep rolling and hell yeah the coals are still gonna roll

Here it is almost mid August 2010 and the economy us still in the pits. As my comments about propane above mentioned, diesel fuel is not the deal that it once was 10 years ago when it was half the pump price of gasoline. Ford now offers HD light trucks F250 and F-350 along with the E-series 3/4 ton with a Roush LPG propane option. The F-150's were the first to offer it but only with the 5.4 liter engine which has a much longer stroke than the 4.6 engine, so it has plenty of torque with LPG. Aftermarket LPG conversions are at least $1,000 cheaper. For any Chev or GMC conversion to propane, spend the extra money and put in the GM parts department sodium filled exhaust valves ( $43 each list ), with labour and parts, head gaskets etc, add $700 to $800 extra but you will have an engine that will run over 700,000 miles with no serious problems. Use extra trans coolers and run a cold 160 degree F thermostat in the summer and change to a 200 degree F thermostat for the cold months of December to mid March. Use only a 15w40,15w50 full synthetic oil for the summer and run a 10w40 or 10w30 for the winter months. In our fleet, we sold the cars after 5 years with between 450,000 and 500,000 miles on them after putting LPG on them when new. None of them had any problems and all had original valve jons and ran great for another 200,000 miles in private use after that. Run only 25 percent antifreeze in the summer as it runs cooler than 50/50. Add a trans cooler and double oil filter of the largest size if towing or if you have a motorhome or taxi or other commercial operation that never shut off till lunch or dinner time. Many limos in this area, have run well over 900,000 miles on the original engines with no internal work until then. No valve jobs or carbon buildups like diesels, and no turbo to burn out. Get a national discount card and buy the propane for less than $1.75 per U.S. gallon and you can even get a very long term contract for propane that you cannot get with any other fuel. Nothing like 105 octane ( R + M ) to take advantage of the latest engine computers and knock sensors. For best use, leave the gasoline system in place and it just starts on gasoline and then automatically switches over the LPG after 3 or 4 minutes. OPEC sucks and why support them?

Diesel is not cleaner than gasoline, the harmful biproducts of diesel are more dense than that of gasoline, so it lingers instead of rising. As far as the comment about the suburbans and yukons, you can special order a suburban or yukon with a diesel, just expect to pay about $10,000 more. Unfortunatly when they do add these emissions products to the vehicle you do lose the horse power that you are buying the diesel for. A great example, the diesel particle filter in the exhaust, since 2007.5. And since this new urea system is based on horsepower per hour, you can expect the duramax to not perform to its expected horse power that you think you would be getting from such a large engine.

All these damn tree huggers are making it impossible to afford a pick up that will pull a load. They are putting all of this pollution crap on the wrong vehicles. One cattalatyc coverter on a gas burner. We have pee burners, catalatyc converters, spark preventors. What other B.S. can these California Tree Hugging Fools think of next. While their riding around in their 500 hp Ferrari they are whining about someone trying to make a living pulling loads down the road for their bitching asses.

I have a 2006 duramax in a 3500 truck that has 522000 miles and never been in the motor or Allision trans. All original Used to pull 3-4 car hauler all over country.When it was new i put a straight flow thru 4 inch Exaus. and put an EGR elimanator on it. Truck still running strong everday....

I will keep my COOL 1995 Dodge 12 valve Cummins any day over this new B.S.

Just because the EPA says something is better for us, doesn't mean that it is. The government just forced out the last USA made incandescent light bulb manufacturer, we are now going to be poisoned by mercury based CFL bulbs in our homes. Now they shove a computer controlled vehicle at us that will punish us should a sensor go out or fluids go low. To bad I was looking forward to purchasing a new truck. hmmm... since mercury is being forced into our bodies by the gov., I wonder if the DEF additive contains dangerous chemicals too?
Remember a few years back in California they forced (the now banned) MTBE on us as a required fuel additive and they ended up poisoning us and our water supplies with MTBE! They said it was good for emmisions but they ended up poisoning us. The new vehicle computer's are now programmed by these same people who think you won't notice mercury or MTBE poison in your bloodstream. I say, No thanks!

Bought a 2011 in August. Have already had trouble with fuel leaking out of the exhaust during the burn cycle. The GM fix is to tighten the coupling on the exhaust just below the motor. The fuel leaks so bad that it steams as if it blew a radiator hose. Had to shut the truck down both times worried that it would ignite. I am questioning if the exhaust coupling is an adequate seal for fluid? Is fuel leaking on the outside of a very hot exhaust a safety hazard?

I have a 2007 2500HD GMC Duromax and get 20-22 mpg highway. Is there anyone out there who has purchased the new engine who could let me know what the REAL (actual) fuel mileage they are getting is. More discussion on the urea then MPG.

I work ata auto parts store and we sell DEF. Its like 8 bucks a gallon,not cheap by any means

I have a 2011 Chevy diesel that i just bought two weeks ago and i took it to Colorado and it had 1600 miles on it when i got there and my message came up saying that i had 480 miles left on my diesel exaust fluid range. Found out that the urea froze in my tank due to cold weather. Also to Steve with the other 2011 my Chevrolet is doing that same thing with the smoke coming out of the diesel exaust fluid thing and it is really as bad as you say it is. My truck is leaking all over the inside of the hood. I am not very pleased with the new truck. Hope you guys are having better luck than i am.

What do we do when the pickup goes into limp mode back on a oil location in the middle of nowhere, Call for a Dodge to pull us out?

Mark4Propane, you mentioned that Diesel fuel was once cheaper than gasoline by about half the price some 10 years ago, not true. Never has been, never will be. Has always ran with in 25 cents one way or the other. Most of the time with in 10 cents. You can check it out at http://www.cga.ct.gov/2006/rpt/2006-R-0556.htm. Now that prices of fuel are peaking the high's again I wouldn't be surprised to see Diesel running 50 to 75 cents higher than gasoline at times, just the way it is.
I have been interested in a Dmax for quite some time. The only thing stopping me is that the injectors have given plenty of people big problems in the past.
Reading about propane as an alternative to Diesel fuel is interesting. Do they get away from the typical injector system that GM uses in those motors or are you still using the same one's?
At an average cost of $4,000 to go through and replace injectors, I would really be leery of purchasing the DMax, but when they are right, they are great motors.

i read in one comment that some one said diesel isnt cleaner than gas i hate to say it yes it is jus because you see kids blowing black smoke doesnt mean there dirty thats un burned fuel that falls back to the ground where gas you cant see the fumes i was told gas will kill you and diesel will make you wish you were dead.i my self am tired of black smoke atleast kids that think they have a power house truck jus cause they blow smoke ooo wow impressive.but then with the emission stuff its hurting more than helping.try this run a mile close your nose and breath through a straw thats what a engine feels like.take the emission stuff and shove it.some one will come up with a exhaust to make it less resrtirctive just give them time the government it trying to kill diesel like the tried with gas in the 70;s wont happen i would still give my 6.5 diesel in for a new dmax.

I think the new Duramax is win win. Better for the environment, a little more power, but also a little more complex. As long as the new technology is reliable for the long run, I'm happy. And for you guys crying about DEF, c'mon, it just gives you something else to piddle around with in the garage, right?

I've had a 08 diesel and highly recommend a spare fuel filter, not many places open on Sunday to obtain one. Presently in the process of buying another duramax in a 2011 HD, and was enlightened by the extra equipment needed to add urea to the system and questions as to cold weather operation. This extra equipment, I will ask for warranty issues from the sales personnel. I wanted a 6.0 gas but will go with diesel because that is the engine they put in the truck I need.

no skid plate on the DEF tank... what is that? the tank sits below the frame rail and is made of plastic. truck was ordered with the Z71 skid plate package. GMC says too bad not acknowledging the potential problem. not impressed !!!

McFadden-

General Motors does not anticipate their customers going off road or needing the skid plate. Otherwise, they would ditch the torsion bars & independent front suspension and switch to a solid front axle like the Fords and Rams.

i bought the new 2011 chevy Diesel , and love it , so what if u have to do some regular add of urea to the truck , its cleaner burn , and u get a tax break from the goverment as well , and as for the black smoke , lets think of what we breath ??? , if u like the black smoke , its time to grow up and deal with what we are tring to protect here is our air , my truck is 6 months old and i have 64,000 miles on it already , i love the power , and the mileage of it , i haul campers all over the US with it , im Proud to have it on my truck , so if some of u dont like it , either deal with it or stick with your older trucks and be stuck in your old times , its time to move forward to better and newer ideas ,

EPA is out of control!
Cut EPA budget and regulations and put more diesels on the road using biodiesel, a renewable resource, like they are doing in Europe. Majority of legislators agree with this but are not doing their job!

2011 GMC Sierra Duramax. Picked up my truck last week and on the third day rolled to a stop only to have the air vents start spewing fumes from the regene process inside of the truck. Seems to be an issue for many of the new LML Duramax engines. GM is being ridiculous about fixing it, saying that I am the only one. If I am the only one why is it so easy to find so many other complaints online about it? Other than not being able to breathe inside of it, I love it. I do think the idea of no skid plate is absurd and many of them are bound to be busted by a rock or stick. My dealership is great just wish the company they represented would get it together!!!

great!! but when can I get myself a suburban with a diesel engine????

the truck is lovely i work at a lube shop chevy realy thinks of all the service people when they made there trucks this one a piece of art thank you for makeng me money ttyl

i have fleet of 18 vehicles all of them airport shuttles 6 are the chevy 3500 duramax sytem with the DEF fluid and I have nothing but problems!!! from no regeneration, to clogged partical filters and other problems that two Dealerships here in colorado can't figure out and they are on the line with the enginers and THEY can't figure out what is going on with my shuttles I have four of them out at the dealerships right now this NEW SYSTEM sucks!

The problem is that we have to appease the Californians and those states who are following in their footsteps. The EPA is just the tip of the iceberg.

Hello,
could somebody give me EMISSION specifications in numbers, how does the Duramax LML ( used with DEF ) COMPARE with the European standard EURO 5 or EURO 6 emission standards? EU 6 : CO 1,5 HC 0,13 NOx 0,4 PM 0,01 Smoke --none

Wouldbe greathful to You; Tamas

We have a 2011 duramax 2500 Chevrolet. Every now and then we notice a little smoke from the exhaust. Has me a little worried. Is this normal. Would appreciate your input. We pull a 29 foot fifth wheel
Thanks
Sharon Hull



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