Engine failures

[ranger0787]

So, my buddy I grew up with suggested a GMC Yukon, Chevy Suburban, Chevy Tahoe to replace my Mercedes GLS550 as I will be pulling a trailer. He also recommended getting the 6.2L. Fine. Ok. I bought a barely used 2023 GMC Yukon Denali XL in Missouri May 2024. The vehicle had @ 4500 miles on it. I flew up to MO, paid for it and drove it back to Florida. I found out about the big 3 problems on the vehicle AFTER I bought the car; 1.) Oversized lifter bores, 2.) AFM/DFM problems, and 3.) Main Bearing failures. Production date was 11/2023 and purchased originally 01/2024. Traded in on a corvette, now I own it.

You guys got me worried; This is my first American car purchase since my 1972 Dodge Charger when I was 20 years old. I've never been stranded, nor suffered a breakdown with any of my previous vehicles.

I put @ 32k miles/year on my vehicles and travel all over the East. The LAST thing I need is for a breakdown to occur. So...

I'm trying to be proactive: I changed out the oil at 7500 miles to Amsoil 0W-20 and also got the testing kit from Amsoil. I had the tech draw off the first 3oz coming out of the pan and sent it off to the lab in Indiana. Results came back great (a green "1") with a complete breakdown what was found in the oil. I expected to find metal shavings. There were none. I called GM, read off my VIN # and they said my vehicle "wasn't affected" by the 3 items mentioned above. I have 12,500 miles on it now and getting ready to do another oil change and also send a sample off to the lab again.

I need 6 feet of unobstructed space from the inside of the lift gate to the back of the 2nd row seat. The Suburban and Yukon XL fit the bill. Nothing from Mercedes, nor BMW have that clearance.

Crossing my fingers...

 

[Marky Dissod]

... LAST thing I need is for a breakdown to occur. So ...
I'm trying to be proactive:
I changed out the oil at 7500 miles to Amsoil 0W20 and also got the testing kit from Amsoil.

Changing out your oil more often than every 7500 miles would extend the life of the engine,
though no one can say by exactly how much.
In your very specific use case of over 30,000 miles a year, I'd STILL change the oil every 6,000 miles, no later.

Remember that GM's Oil Life Monitor is NOT programmed for you to Denali forever.
GM would prefer you replace this vehicle some time after 150-something-thousand miles, not keep it forever.

Amsoil testing Amsoil ... sounds like when a government agency investigates itself, and 'finds' it did no wrong.
I'd prefer an impartial 3rd party.

I recently switched to Valvoline Restore & Protect, which is also available in 0W20.

 

[ranger0787]

Changing out your oil more often than every 7500 miles would extend the life of the engine,
though no one can say by exactly how much.
In your very specific use case of over 30,000 miles a year, I'd STILL change the oil every 6,000 miles, no later.

Remember that GM's Oil Life Monitor is NOT programmed for you to Denali forever.
GM would prefer you replace this vehicle some time after 150-something-thousand miles, not keep it forever.

Amsoil testing Amsoil ... sounds like when a government agency investigates itself, and 'finds' it did no wrong.
I'd prefer an impartial 3rd party.

I recently switched to Valvoline Restore & Protect, which is also available in 0W20.

Amsoil doesn't do the testing.

 

[Antonm]

Amsoil doesn't do the testing.

You might want to blackout your personal information on that attached PDF oil analysis report. As it is now, you have your name , address, and phone number posted on the internet for all to see.
...

 

[Tahoe14]

Antony you are correct don’t make it easy on personal information but if you do a Google search on a person unfortunately there is information about a lot of us already out there.

 

[Antonm]

Antony you are correct don’t make it easy on personal information but if you do a Google search on a person unfortunately there is information about a lot of us already out there.

But nothing,,, no reason to make it easier on identity thieves by leaving low hanging fruit.

I'm a partially disabled veteran and the VA gets hacked about twice a year and loses everyone's information (I've gotten several of the "we're sorry, but your information got hacked again" letters from the VA). And I've also had fraudulent charges on my bank accounts a few times (likely a result of the many VA hacks as I keep changing accounts every time the VA gets hacked), so by your logic I should just put my name, address, and SSN on a sign in my front yard.
...

 

[Tahoe14]

Antonm, I never said you should put your information out there, I agreed with you and I was just stating a fact if you think all of our information is a big secret. Retired law enforcement and I could give you multiple examples of the information that is available. Thank you for your service.

 

[swathdiver]

Amsoil doesn't do the testing.

You got more metal (about double) in your oil than mine when it had 187K on it. If that is your first oil change with the new oil, do two more and take a sample. Then run 3 with the oil that was made for your car, ACDelco and take a sample.

I did this between Mobil One and ACDelco and the metals were reduced dramatically and she even got slightly better gas mileage. Any day now I'll have a report back from BlackStone-Labs on how Quaker State compares to the ACDelco after 3 oil changes.

 

[Hiebs]

I have a 2022 with the 6.2, changed the oil every 4500 miles, at 27000 the motor blew a 1000ilesnfrom home while on vacation. Lifters went, dealership replaced the lifters in both banks, the tech at the dealer went to test drive after the repair and the mains blew out 2 miles from the dealership. Didn't have the truck for a month, ( had to wait for a motor for replacement, and there were other vehicles sitting there ahead of me, waiting for the same thing ). GM was useless, the dealership was great, but GM was horrible. Lost 4 days of vacation, my case worker was horrible, and GM was kind enough to use a remanufactured motor, didn't replace with a new one, and didn't offer to extend warranty on it. So it has the remainder of the original motors warranty, and from reading other posts I may have the same issue again.

 

[ZKWBQD]

So, my buddy I grew up with suggested a GMC Yukon, Chevy Suburban, Chevy Tahoe to replace my Mercedes GLS550 as I will be pulling a trailer. He also recommended getting the 6.2L. Fine. Ok. I bought a barely used 2023 GMC Yukon Denali XL in Missouri May 2024. The vehicle had @ 4500 miles on it. I flew up to MO, paid for it and drove it back to Florida. I found out about the big 3 problems on the vehicle AFTER I bought the car; 1.) Oversized lifter bores, 2.) AFM/DFM problems, and 3.) Main Bearing failures. Production date was 11/2023 and purchased originally 01/2024. Traded in on a corvette, now I own it.

You guys got me worried; This is my first American car purchase since my 1972 Dodge Charger when I was 20 years old. I've never been stranded, nor suffered a breakdown with any of my previous vehicles.

I put @ 32k miles/year on my vehicles and travel all over the East. The LAST thing I need is for a breakdown to occur. So...

I'm trying to be proactive: I changed out the oil at 7500 miles to Amsoil 0W-20 and also got the testing kit from Amsoil. I had the tech draw off the first 3oz coming out of the pan and sent it off to the lab in Indiana. Results came back great (a green "1") with a complete breakdown what was found in the oil. I expected to find metal shavings. There were none. I called GM, read off my VIN # and they said my vehicle "wasn't affected" by the 3 items mentioned above. I have 12,500 miles on it now and getting ready to do another oil change and also send a sample off to the lab again.

I need 6 feet of unobstructed space from the inside of the lift gate to the back of the 2nd row seat. The Suburban and Yukon XL fit the bill. Nothing from Mercedes, nor BMW have that clearance.

Crossing my fingers...

I would change your oil more frequently. I change mine every 3,000 miles. There may be restrictions on this if you live in California.