Thinking of selling my new 6.2L Denali...

[JKeller]

No offense was meant by anyone. I asked the question because it is highly unusual for someone to change oil at 15k miles on these trucks. That does not mean that it is wrong or anything else negative with the practice, it simply means that this specific oil change mileage interval is different than the norm. Regarding opinions, we all have opinions and we are all free to express them in a respectful manner.

No offense was taken. I agree that if I weren't using Amsoil Signature, I would be changing my oil either every 3k miles with conventional oil or 7,500 with Mobil 1 synthetic. I may do a blackstone analysis some day like someone suggested but it is hard to find the motivation to go through that hassle when the Amsoil comes out looking pretty clean at 15k, it has a fantastic reputation, and this truck is on its way to being my third high mileage vehicle with Amsoil.

 

[PPV_2018]

That is good feedback. I would like some concrete evidence that the failure rate is low. I know 3 people with this engine and one is bad.. I am hoping it is a low rate of failure and if it is I would certainly keep the rig. I see what my buddy is going through with GM to get resolution on his and it is not pretty.. Do you have a basis for an opinion that the failure rate is low?

I do. . . Here is an excerpt of a post i made last year:

. . .
numbers never lie. There have been over 4 million GMT 900, K2, and T1 Tahoes/Burbs/Yukons produced and sold between 2007 and now. Add in the pickup versions and it’s probably double that. That’s a lot of AFM/DFM/DOD engines Produced and in circulation.. can’t tell you how many GMT 900/K2/T1 trucks I see on the road every day, but it’s a lot.

There’s no shortage of failure stories on this forum, but the total number of complete failures of gas engines likely makes up less than 0.1% of total Tahoe and Burb owners in the country. To add to that, a large majority of the failures you hear about are not from longtime owners/members, but rather from people who had a failure, joined the forum to complain about it, and then disappear forever.

I WILL say though.. the majority of failures we hear about are T1+ with the 6.2.. but again, a minute number relative to the amount produced. . .

To add to that, we can take that 4 million number and put it up to close 10 million, because certainly there have been more pickups than SUV’s produced and on the road. (I come to that conclusion, if 4 millions SUVs have been produced and on the road then at least double that plus+ some for the pickups)

O.K. So roughly ~10 million trucks. NHTSA opens investigation saying ~800K “potentially” trucks affected, that’s less than 10%, and on such a huge sample size ~8% is indeed a lot of trucks, but i highly doubt 800K trucks actually have had or are going to have catastrophic failure. The number is probably actually much, much lower.

The reason we hear about is so much , is because the voice of negativity often over-rides the voice of positivity. Nobody comes to brag about how reliable their truck is, and if they do, it’s often over looked or quickly forgotten. But people certainly join this forum and other outlets, to say they’ve had a failure, and naturally it gets attention.

Say you want to go to a pizza place you have never been to. If you look online and there are 20 good reviews, but 2 bad reviews, chances are you go and read the bad reviews first. And if those TWO reviews are bad enough . . . You probably won’t care so much what the good reviews say.

So I stand my by statement. Obviously I’ve come to this conclusion without hard numbers of actual failure rates, but then again nobody can prove exactly how many failures there have been either, so .. yeah.

And I believe that a NHTSA investigation and potential mandatory recall may actually benefit GM as opposed to class action lawsuits, as i have previously stated in another thread.

BOTTOM LINE:

Do what you will, but i do think it’s unfortunate that voices of negativity are getting to people that *might* or ****MIGHT NOT**** have an otherwise perfectly reliable vehicle. we just don’t know. And to those who have been afffected, i truly feel for you. As *AGAIN*, I’ve stated in another thread, GM should be held liable for every failure they’ve had, so i am not sympathizing or standing up for GM, and my post should not be construed in such a manner.

 

[CrashTestDummy]

The NHTSA IS doing an investigation of the engine failures on the GM 6.2 L87 engine. There were 877,000 produced from 2019 to 2024, and there are officially 39 known complaints of engine failures. That's a 0.004% failure rate. Not bad, IMHO. Yes, the failures get people's attention, but it seems to be relatively low.

https://www.roadandtrack.com/news/a...m-suvs-and-trucks-over-reported-v-8-failures/