What's your thoughts on the Duramax?

I have a 2013 2500HD LML and love it. My son-in-law has a new 2018 2500 Denali and it has noticeably more power than mine. Awesome truck.

FishOnOne wrote:

falconbrother wrote:
What's your, knowledge, thoughts, experience, on the GM Duramax diesel?

It's good but I would stay away from the LMM due to lacking def on the emissions side.

As for the LP5 it's a completely new design that has had some bumps along the way.

The LLY was infamous for overheating. It was GMs first attempt to up HP from the LB7 and was a disaster when towing heavy.

My 05 is still making us very happy with 98000 miles for towing our 2001 35 ft alpenlite. Looks like we have old stuff but have a 2018 car in our garage.

chevman 2 times

My 03 GMC Duramax is the worst truck I've ever owned. My 2010 GM with the Duramax was a good truck.

The L5P is proving to be a very capable motor and with the Denso pump, no more CP4 issues!

donn0128 wrote:

Grit dog wrote:
Well, the Dmax is the ONLY diesel out of the big 3 that hasn’t changed displacement or been scrapped for an all new engine. That says a bunch. Apples to apples, the Dmax gives up nothing to any of the others, year by year, save for the Cummins being simpler for some repairs and the Cummins still being very arguably the longest lasting internals.

Well, thats not entirely true. If it were so, how then could the block handle the increase from arounf 350 HP to over 700 HP? The displacement might be the same, but the basic motor is vastly different from the original 2001 motor.
Since 2001 Ford has had foir totally different motors. And Dodge/Ram has had two.
The bottom line, used you have to be aware of some years. New, I would not be afraid of any of them.

What are you talking about? 700hp? Sure there are 700hp Dmaxes, but most of them are pulling or drag trucks and not many are even making that on fuel only. HOWEVER most of those big numbers trucks are LB7s to LBZs still.
Fwiw, the old Dmaxes will hold new truck power 450/900 ish easily.
And Ram hasn’t had 2 completely different engines, although the 6.7 is punched.
There also really aren’t any Dmaxes to stay away from anymore.
Early ones have already had injectors or the rare HG and no one expects a 15 year old engine to not need some work.
Bottom line they’re as solid as any.

The Dmax didn't change displacement because it was designed starting in 1998 after the many of the future 2003-2007-2010 EPA emissions regulations were either already ratified or proposed. So GM knew what was about to happen when designing the Dmax while International and Cummins did not have the luxury of knowing about these emissions regulation when the 7.3L and 5.9L were being designed in the 80s.

When the 2007 regulations were finalized in 1999-2000, Cummins started development on the 6.7L knowing that 5.9L would be big enough to keep up with emissions regulations and power demands. So the main reason why the Dmax has stayed at 6.6L is majorly due to the fact that they knew what was coming when designing the engine while the others didn't when they designed the engines they were using at the time.

falconbrother wrote:
What's your, knowledge, thoughts, experience, on the GM Duramax diesel?

It's good but I would stay away from the LMM due to lacking def on the emissions side.

As for the LP5 it's a completely new design that has had some bumps along the way.

I wish I'd never sold it.

Grit dog wrote:
Well, the Dmax is the ONLY diesel out of the big 3 that hasn’t changed displacement or been scrapped for an all new engine. That says a bunch. Apples to apples, the Dmax gives up nothing to any of the others, year by year, save for the Cummins being simpler for some repairs and the Cummins still being very arguably the longest lasting internals.

Well, thats not entirely true. If it were so, how then could the block handle the increase from arounf 350 HP to over 700 HP? The displacement might be the same, but the basic motor is vastly different from the original 2001 motor.
Since 2001 Ford has had foir totally different motors. And Dodge/Ram has had two.
The bottom line, used you have to be aware of some years. New, I would not be afraid of any of them.