Out with 6.2 in with 3.0
- Thread starter JacoZR2
- Start date
- Jan 1, 2023
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Nice...but, as you may or may not know, the 3.0 diesels are having a ton of issues and they are becoming the next big engine failure problems for GM. I am hopeful that the new 2027 engines coming out will finally be worth there salt and that GM will get it right...wishful thinking I know
MO_ZR2
Founding Member
- Mar 18, 2022
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- 1,454
Can you post some hard data to reflect “tons of issues”? I’ve read some posts and watched some videos but I’ve yet to see any actual data around GM recall numbers, etc. I know many people personally to have 6.2 lifter and engine replacements but have yet to run into anyone with a 3.0 engine issue. You’ve mentioned something similar to the above a few times so curious on your sources (other than forum drama)Nice...but, as you may or may not know, the 3.0 diesels are having a ton of issues and they are becoming the next big engine failure problems for GM. I am hopeful that the new 2027 engines coming out will finally be worth there salt and that GM will get it right...wishful thinking I know
- Jan 1, 2023
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- 8,707
I have watched several videos by many different well respected auto "You Tubers" that clearly outline the issues with the 3.0. It appears that they are primarily occurring in the 2025 - 2026 3.0L motors. You can easily find what's going on if you look for it. I'm not trying to create any drama. However, based on all that's being posted on the internet, a 6.2L or a 3.0L Babymax are two motors I would stay FAR away from for now. I think we all hope the newly designed 2027 motors will finally get GM out of the hole they're in but I believe we all have our doubts about that!
AXE
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- Feb 21, 2023
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I'll take a recall 6.2L motor with a 10 year/150k warranty over a "new GM motor" any day of the week. I just seen a 26 6.2L with a motor failure on Reddit. GM ain't fixing anything.
The 3.0L motor issues are primarily timing belt and main crank bearing excessive endplay issues. Nothing new there, been playing out as long as the 6.2L issues, but not sure it's a widespread.
The 3.0L motor issues are primarily timing belt and main crank bearing excessive endplay issues. Nothing new there, been playing out as long as the 6.2L issues, but not sure it's a widespread.
- Aug 4, 2025
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MY source for 3.0 related stuff is Greg Nelson Demon Works YouTube. He's a GM master tech in Utah that works on these 3.0's. He also has newsletter called Duramax News (best viewed in duck duck go browser) where he gives updates and bulletin numbers and write ups to related issues that sometimes the service department/GM won't bring up. It's first hand knowledge at its best. I had my thrust bearing checked last week on my 3.0, it measured .092 which is on the tight side. SA showed me the video and there was no movement. SA told me they did have 3.0lzo that failed two months ago that had a complete engine replacement. SA also told me there has been occasional issue with bad exhaust clamps.
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