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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 10-25-2007, 11:07 AM   #1 (permalink)
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Duramax Longevity in Question?

Not sure of the validity of these statements. A friend told me to check out their website www.gooddiesels.com Maybe I should have done more research... I'm really happy with my '06 D/A

"Many people want to know why we don't sell any GM diesels, specifically the Duramax diesels. Let me start by saying that the GM truck is absolutely awesome, we are not biased. The transmission is relatively good, frames are rigid and the rest is all great. The problem is that the motor is in our opinion a "consumer" diesel, not a "commercial" diesel. Explanation: The International Navistar in the Fords and the Cummins in the Dodges are found in all sorts of commercial applications. It is in the Ford and Dodge pickups, UPS trucks, FedEx trucks, tow trucks, school buses, Recreational Vehicles, ambulances, fire trucks, to name a few. Ford and Dodge chose the International Navistar and the Cummins, respectively, to use in their pickups. The Duramax is found almost NOWHERE but in the GM pickups. Even Isuzu, who partnered with GM to build it, doesn't use it in any of their commercial applications. Check it out and see for yourself. Furthermore, the Duramax is rated by it's own manufacturer for a 225k mile life expectancy. The 7.3 Navistar and 5.9 Cummins are both rated for 375k miles and easily last twice that and more. Why would you knowingly buy a truck that is rated to be little more than half as good by it's manufacture, as it's competitors? The short life expectancy is partially due to the undeniably brutal power produced by this motor. The Duramax is a 22:1 compression motor that uses a cast iron engine block with aluminum heads held on by steel head bolts. A combination of three different metals that expand different amounts at different temperatures. This along with massive amounts of boost from the turbo to aluminum heads under extremely high compression makes for phenomenal power, but in our opinion it has no longevity or reliability. We shop hundreds of trucks every month all over this great country and have SELDOM seen a Duramax with anywhere near 200k miles or more on it. Go ahead and try and find one for yourself, I have. Maybe we're old school, but if you're looking for a diesel that's going to last you awhile before major repairs, the Duramax is not it!..... Isn't a major attraction of buying a diesel the longevity and reliability issue? You can make safe, RELIABLE power with the Fords and Dodges and avoid costly repairs as well. We only sell products that we know and trust. It makes us no money to NOT to sell the Duramax, in fact we lose money by not selling GM Duramax trucks. Unfortunately we can't sell GM Duramax trucks in good faith, knowing the facts as we, so we don't."

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Old 10-25-2007, 11:10 AM   #2 (permalink)
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Good thing I only got 57K on mine...

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Old 10-25-2007, 11:19 AM   #3 (permalink)
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Has to be old, states the compression at 22...it is lower now, and it doesn't mention the 6.0 or the 6.4 Ford diesels, not to mention dodges new one.
I would for one not worry.
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Old 10-25-2007, 11:19 AM   #4 (permalink)
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i could be wrong, but i dont think the duramax has a 22:1 compression ratio. IIRC i thought it was more in the area of 15-18:1 ratio? maybe some of the guys who tear these things apart all the time and hotrodding the hell out of them will chim in because i they know a ton more than i do.
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Old 10-25-2007, 11:22 AM   #5 (permalink)
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That is their opinion and they are entitled to it. So here is mine. The whole statement is biased crap. I suppose that if I were FedEx or Ups then it may matter to me how many of those engines are in commercial applications and a "manufacturer rated" difference of 100K or so may matter. Bottom line for most of us we will not keep our trucks long enough to see 275K and there are plenty of examples of Duramax's running well over that. Now this opinion is coming from a hard core Ford lover that was converted away from the PSD. I loved my 7.3 but when I compared the 06DA to a 06PDS the GMC was a far better truck and came with a better deal. One of my friends bought the 06 PSD when I bought the GMC. We have now had the trucks almost 2 years. On our last trip out with the 5th wheels he came up and said that he is going to go look at the new GMC. His truck has not been a bad truck by any measure but is does not perform as he hoped it would. I have a bigger trailer and out perform him in all areas except for fuel millage. He smokes me there. So there is my long winded .02 no flames just another opinion based on nothing more then emotion.
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Old 10-25-2007, 11:24 AM   #6 (permalink)
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It sounds like an opinion from one or two guys that own a Dodge and a Ford. We all know that contracts from one company to another are made by sales people above the consumer level sales office. In other words, A sweet deal was made between UPS and Dodge or Ford and whoever they target for their corporate business. As an example>Ford Tarus used out sell all other brands and it looked great in statisics but in fact most of the cars were sold to rental companies at a cheap price. Those companies only used them for a year or two. This article looks like rubbish to me. And that is my opinion.
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Old 10-25-2007, 11:27 AM   #7 (permalink)
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I noticed recently that there was a thread about a 400K mile Duramax. And, I'm sure there are many other members here who have 100s of thousands of miles logged, as well. There are also a lot of Duramax-es in marine applications, including racing where WOT for hours is the norm. I'm not sure where the static compression ratio information came from, but the static compression in my Duramax is right around 16.8:1, and I think that is only down from 17.5:1 in previous generation configurations.
Oh, and don't commercial applications go through a contract protocol that is generally based on lowest price? Perhaps that is why Duramax engines aren't found in very many mundane applications.
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Old 10-25-2007, 11:33 AM   #8 (permalink)
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Its interesting they say they do not see the duramax in nothing but the pickups, I guess all the chevy medium duty ambulances that Ive installed and serviced radio equiptment in that were Duramax powered were fakes? I worked on quite a few in Pittsburgh, PA area, and in Clearfield county, PA aswell. Both places had medium duty chevy chassis with Duramax diesel motors. I have also seen fire trucks that were duramax powered, obviously Medium duty trucks aswell. They comment about the PSD and Cummins being in all these trucks trucks, but fail to realize that they do not exceed medium duty either, as they just arent big enough for larger then that, thats when large cummins and cat etc take over. UPS builds their own trucks, and have been around long before the duramax came out, They might just be happy with the ford platform, and it just might be too much work for them to change. Or they could be under contract? I dont know if fedex builds their own or not. Just my .02 Look how many people have over 200k on the clock in the forums?
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Old 10-25-2007, 11:45 AM   #9 (permalink)
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What a bunch of crap. Dodge dealers have pushed this in my area for a while now to pump the Cummins. The Duramax was made and designed to be run in GM pickup trucks, it wasn't "stolen" from the commercial world and stuffed in a pickup and power-pumped to fight in the big three HP wars. Funny that after initial growing pains when introduced, you don't hear much about issues. Also try to find a used one on a lot, I get the whole "they didn't make as many" view, but the ones that I see on lots were driven 100K+ before gotten rid of.

Just my $0.02, coming from a guy that used to drive a so called "commercial grade" motor that was inferior.
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Old 10-25-2007, 11:53 AM   #10 (permalink)
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These guys are just slick talking used truck dealers that can't find GM trucks going cheap at the auto auctions. No used car/truck dealer is going to pay top dollar for a car/truck at an auction because there would be no profit margin. There is so much misinformation in that "story" I wouldn't believe anything they say much less buy a truck from these clowns.

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