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2025 Sierra Denali

awh3rgm
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awh3rgm Enthusiast

awh3rgm

Posted
Posted

I ordered a new 2025 Denali a few weeks ago however since then I was told by the service manager they are seeing 1 -2 6.2 liter engine failures a week with very low milage. Has anyone heard or had an engine failure in a 2025? Supposedly they found the problem which was contamination in some of the engine components and addressed it however I don't want to be one of those folks it happens to. I had good luck with GMC so far since switching in 2019.

Jus Cruisin Enthusiast

Jus Cruisin

Posted
Posted

I have a subdivision full of GMC, Silverado, Yukon and Escalades. They are coming and going daily. I haven't lost sleep over mine 2023 Sierra Denali Ultimate 1500 6.2l. If it has an engine issue, I'll have it fixed. They know how. Or, I might just trade for a new one. I've had this one long enough to justify a trade at this point for me. 

Bikerjon Enthusiast

Bikerjon

Posted
Posted
5 hours ago, PunchT37 said:

I ordered a `25 with a 5.3. Internet covered with lifter problems. It`s at my house now. So...

I have a 23 Trail Boss Custom with a 5.3 8000 miles. No problems with lifters but I did install a DFM delete from Range Technologies when they first came out a couple of months ago. My last truck was a 21 TB w/o DFM. No lifter issues on that one either. I am changing oil at 3000 and not worrying about my lifters. Everything has been great for me.

redwngr Senior Enthusiast

redwngr

Posted
Posted
1 hour ago, Bikerjon said:

I have a 23 Trail Boss Custom with a 5.3 8000 miles. No problems with lifters but I did install a DFM delete from Range Technologies when they first came out a couple of months ago. My last truck was a 21 TB w/o DFM. No lifter issues on that one either. I am changing oil at 3000 and not worrying about my lifters. Everything has been great for me.

 

Is that the 'change it once a year' program?

Bikerjon Enthusiast

Bikerjon

Posted
Posted
On 12/20/2024 at 11:19 PM, redwngr said:

 

Is that the 'change it once a year' program?

Change what? The oil or the truck?

  • Haha 1
redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)

oil

 

I guess it depends on when the 23 was purchased since it could be anytime after about Sept/Oct 22

 

Figuring that with 8000 miles on a 23, it's possible it runs about 3000 miles per year so 3000 mile oil changes would be an annual thing. 

 

 

The oil life thing will also reach zero year after it was reset. 

Closer to 7500 miles on higher use vehicles

Edited by redwngr
Z45 Senior Enthusiast

Z45

Posted
Posted (edited)

Its not the oil that's the problem. Its the design with all the moving complicated parts and acceptable tolerances on the parts.   The fact that RAM uses the same DFM/AFM technology and experiences the same failure rate is proof in my opinion of the faults of the AFM/DFM technology.  IMO.  My brother went 4 yrs on his 2021 Sierra and had no problems. My neighbor has 150,000 miles on a 2012 Sierra, not lifer or oil burning problem. Common thread with both, just a truck and they don't give it a second thought, just drive it.  Mention DFM/AFM and they have no idea what that is.

Edited by Z45
  • 5 months later...
tonzmn New Member

tonzmn

Posted
Posted

Just picked up my new 2025 Denali 6.2 exactly 3 weeks ago so not much time for things to happen; however, so far so good.  I followed the new vehicle rules on taking it easy for the first 200 miles.  Keeping my fingers crossed but not going to lose sleep over it.  It if needs replacing it won't be on my dime.

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