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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 04-26-2006, 04:24 PM   #1 (permalink)
Bulldogger
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Engine longevity

I'm a little upset that the Duramax engine longevity testing shows the engine will only last upwards of 200,000 miles. I would have thought a diesel engine would run at least 300,000 miles. Does anyone have any insight as to how the trucks are tested to determine this rating. Hell I've had gas motors make it 200,000, I thought the design purpose behind diesel was longevity and that is one of the reasons you pay the premium for it. Somebody in the know shed some light on this. Cummins rates the motor at 350,000 miles. That seems to be alot more miles then the Duramax.
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Old 04-26-2006, 04:35 PM   #2 (permalink)
DURAtotheMAX
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thats simply the least amount GM says it should last. Yours isnt gonna blow up at 200,001 miles. It doesnt mean anything tho...plenty of Dmax's have sailed passed that mark with no major problems (excluding injectors). I forget the various names of people on here, but various people have 346k, 250k, 419k, 496k (I think, thought I heard that somewhere), 316k, 160k (on a 2005!!). I wouldnt worry about it.

I beleive Cummins rates their engines at 300,000 miles (or 350k?) at MEDIUM DUTY power levels (in the 200-300hp range). The life expectancy probably goes down accordinly when run at the much higher pickup/light duty power levels.

Bottom line, if any engine is taken care of and not abused, had regular maintinence, it will last a long time.
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Old 04-26-2006, 04:53 PM   #3 (permalink)
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DuratotheMax,
Thats kind of why I was wondering about the testing. You have B10 and B50 ratings. I was wondering how they are being rated. If 200,000 is a B10 rating that's pretty sweet.They mention the engine life rating in the performance module notification, and that got me curious as to how they're arriving at their numbers.
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Old 04-26-2006, 05:02 PM   #4 (permalink)
McRat
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Quote:
Originally Posted by Bulldogger View Post
I'm a little upset that the Duramax engine longevity testing shows the engine will only last upwards of 200,000 miles. I would have thought a diesel engine would run at least 300,000 miles. Does anyone have any insight as to how the trucks are tested to determine this rating. Hell I've had gas motors make it 200,000, I thought the design purpose behind diesel was longevity and that is one of the reasons you pay the premium for it. Somebody in the know shed some light on this. Cummins rates the motor at 350,000 miles. That seems to be alot more miles then the Duramax.
Let's see your source of info. Is this MTBF (mean time between failure)? Suggested overhaul?

Where's this Cummins engineering report on the High Output common rail life expectancy?

You've owned a 360HP gas engine that went 200,000mi in a 7000lb truck?

You've seen a stock Dmax that "wore out" at 200,000mi?

Or have you been reading the Dodge Boards:

"The Dodge Cummins is the only engine that has flown to the moon and back! We get 500,000mi between oil changes, and get 50mpg towing 75,000lb uphill. By just changing injectors, we can make 7,500HP and our mileage actually DOUBLES!!!"

Truth is, the Dmax is only 5 years old. Few people (none?) have reported a "worn out" engine.
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Old 04-26-2006, 07:18 PM   #5 (permalink)
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:
Quote:
"The Dodge Cummins is the only engine that has flown to the moon and back! We get 500,000mi between oil changes, and get 50mpg towing 75,000lb uphill. By just changing injectors, we can make 7,500HP and our mileage actually DOUBLES!!!"
agreed:
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Old 04-26-2006, 07:59 PM   #6 (permalink)
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Hey McRat,
Try reading my second post before you get your panties in a bunch. My source is from all data about power modifiers. My question is how are they getting the data for the determination of mileage.
For info on engine life on the Cummins, simply go to the Cummin's website it list cummins longevity as 350,000 to overhaul. No mention of different model engines for cummins either, and I am not talking about rail life either. Since you seem to be so inquisitive read the info below right under Duramax Life expectancy, and you tell me where they get this info, or how they get it. They also make reference to all three engine models so Hp/Tq isn't factoring into the equation. If you still need more info for the Dodge I will happily cut n paste if for you. Bottom line is I own the truck in my signature, and wouldn't trade it because it's great, but I would still like an answer to my question and not the GRAND INQUISITION. They state the Duramax has been tested to survive upwards of 200,000 miles but make no mention of B10 or B50 life. So how are the numbers derived? what kind of testing is used. Based on their statement as it stands, I am not impressed with the engine longevity mileage.

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Old 04-26-2006, 08:15 PM   #7 (permalink)
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Bulldogger dont you just love some of the replies people get in here

Wish i could answer your question but the duramax hasent really been on the market long enough to realy say. But personally I dont think about it much it should run good for a very long time jmho. I use to drive old beat up toyota trucks with the 22R engine and get 300,000 miles and sometimes more lol, and they were probably rated for a lot less miles then that.
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Old 04-26-2006, 08:31 PM   #8 (permalink)
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Quote:
Originally Posted by Bulldogger View Post
For info on engine life on the Cummins, simply go to the Cummin's website it list cummins longevity as 350,000 to overhaul. No mention of different model engines for cummins either, and I am not talking about rail life either. but I would still like an answer to my question and not the GRAND INQUISITION. I am not impressed with the engine longevity mileage
if its from the Cummins website its most likely stated in regards to medium duty applications, not the high hp/torque pickup truck applications.

In defense of McRat, his answer is perfectly acceptable. You asked a million dollar question. There is no answer for it. Someones Duramax could blow up tomorrow with 25,000 miles on it...the next guy's Dmax could go 500,000 without major issue. SAME situation with the Cummins. JUST because they say "it should" last 350,000 miles means NOTHING. Same thing for GM's stated 200,000 miles...means nothing. There are so many thousands of variables that have to be factored in to determine actual engine life that it really is impossible to tell how long your particular engine will last. GM could have tested the Duramax to higher mileage and it most likely would have done fine, as represented by the MORE than a few members here with over 200k miles. The Duramax has only been around since 2001...there really wasnt half as much time to test it has the Cummins. Also, because it has only been out since 2001, NO ONE can make fair judgements or assumptions on how long the Duramax will last or how reliable it is. Come back in 3 or 4 years, when the 2001's are getting up in miles and you'll have a much better idea whether the Dmax is a good long lasting engine or not.

"I am not impressed with the engine longevity mileage"

please dont take any offence to me saying this, but thats a pretty blind assumption if you base everything your oppinion of the Duramax (or any engine for that matter) on that one statement. GM tested the Dmax (and all of their engines) in marine applications/environments for the equivilent of 200,000 miles. As you may know, marine duty is MUCH MUCH more brutal and hard on an engine than on the road. With proper maintinence, regular oil changes, and no abnormal abuse, (im not talking hard towing or the like, I mean like REALLY neglectfully beating the crap out of it, no oil changes, holding the engine at 1600+ degrees EGT etc..) ANY engine will last a long time. I have no reason to doubt the Dmax will exceed its "expected life" on a regular basis without major issues. As I said before the phrase "expected life" means nothing in the real world, and is just something to keep the number crunching, specification printing people at GM happy.

JMO..
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Old 04-26-2006, 09:03 PM   #9 (permalink)
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Duro,
I agree with you, but I still don't like the statement and want to know how the engine is tested. Load cell full open till it pukes or what?? Somebody must know what type of tests are performed, hell they got a result. I also know of several who have reported over 300,000 miles. That's not what I'm worried about, I have great faith in the truck. Real world testing shows a difference, so how did they come up with their numbers. To me their statement implies the engines didn't make it too 200,000 they failed before. Otherwise it would read, tested engines have exceeded 200,000 miles. I know there are several variables that will effect outcome in the real world, I'm more interested in their results.

Oosel,
1 toyota pickup 273,000 sold still running, a toyota celica 185,000 sold still running, a chevy tahoe 160,000 sold ran sweet.
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Old 04-26-2006, 09:07 PM   #10 (permalink)
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I don't remember where I read it, in an automotive review mag comparing diesel truck engines I think, but the article stated that the Cummins was a medium duty rated and the Dmax and Powerstroke were light duty rated. It also said the Cummins is the only one of the three engines that is rebuildable due to having cylinder liners. Perhaps this has something to do with the mileage life rating differences? Just my two cents. Feel free to correct me if I am wrong. Just stating what I read.
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