Yukon 2022 6.2 engine died at 75,000 miles.

[viven44]

Yes, that is what I think happened as I noted here in this post below

@Vladimir2306 your vehicle was involved in the recall and GM had specifically made a recommendation to move to 0W-40 on those set of engines, and your engine failure here is just too much of a coincidence to look past unfortunately. P0016 was found apparently on a subset of engines, not all.

My guess on what happened
1) as the bearings got hot, the engine started loading up and the speed went down without you pressing the brakes
2) your cruise control thought you were climbing a hill and downshifted to increase engine RPM
3) which caused the engine heat up and load up more
4) back to 2)

I do think the cruise control downshifting the trans to keep the speed was probably what really just a reaction/effect, but the root cause was likely the bearings overheating and causing the engine to come to a halt....

Having said that, you have skilled mechanics at your disposal, so seem to be in good hands now. You should follow your engine rebuilders guidance on oil viscosity from now as they are your warranty.

Keep your receipts who knows maybe you can pursue GM for expenses and recover the money since the recall is in effect.

 

[Vladimir2306]

This is interesting!

Vladimir, did your service find any wrist pins missing?

Thank God there are no wrenches forgotten in the engine either)

 

[Vladimir2306]

Was cruise control still engaged when the transmission started to downshift? I am thinking if the engine is starting to fail, you have commanded the cruise to maintain a certain speed and as the engine loses power the transmission will shift into a lower gear to try to keep the selected speed.

Yes, cruise control was on. This is strange. Because it should immediately turn off when an Engine Error appears. And since there were none, it turned out to be not a synchronous action, the engine tried to turn off, and the cruise control kept it at a given speed

 

[Vladimir2306]

Yes, that is what I think happened as I noted here in this post below

Yes, it is quite possible. We just discussed it with the service yesterday. So far, we have decided to fill the oil with 0-40, firstly, the break-in of the new engine, and secondly, there is no longer a goal to drive this car for a long time. I think in the summer to order Yukon 2025, if everything works out, and this one is for sale)

 

[BacDoc]

Yes, it is quite possible. We just discussed it with the service yesterday. So far, we have decided to fill the oil with 0-40, firstly, the break-in of the new engine, and secondly, there is no longer a goal to drive this car for a long time. I think in the summer to order Yukon 2025, if everything works out, and this one is for sale)

I am at 80% oil life since my last change and thinking of going to 0-40W, but that will be 4 oil changes since new and I have 12k miles on odometer.

Does your service think the 2025 motor is different from the one that they are preparing now? Will they advise 0-20W on the 2025 as GM spec?

 

[Vladimir2306]

I am at 80% oil life since my last change and thinking of going to 0-40W, but that will be 4 oil changes since new and I have 12k miles on odometer.

Does your service think the 2025 motor is different from the one that they are preparing now? Will they advise 0-20W on the 2025 as GM spec?

Since my new engine was released in May 2024, they began to look for engines after 183 days of 2024, and found it in St. Petersburg, with a production date of November 2024. But there the client said to install the engine without opening, without modifications, as it is. So, unfortunately, they didn't manage to watch it, but they want to study what has changed. It seems that they checked the catalog, for example, the connecting rod liners remained the same as before, gray. But this still needs to be studied. As for the oil, their opinion is as follows, the 0-40 oil leads to additional loads on the lifters, and most likely if the l87 is poured 0-40, then after 75-90 thousand miles they will need to be replaced, as it was on the 6.2 4 generations. But in my case, with a bored engine with increased clearances, 0-40 oil will be useful, especially during the break-in period. But in general, they are still for oil 0-20. Because the problems that are happening now are not related to the oil, even if there is oil with an index of 90, if the engine is running dry.

 

[Vladimir2306]

I am at 80% oil life since my last change and thinking of going to 0-40W, but that will be 4 oil changes since new and I have 12k miles on odometer.

Does your service think the 2025 motor is different from the one that they are preparing now? Will they advise 0-20W on the 2025 as GM spec?

I advise everyone to open the engine pan, and see the condition of the connecting rod liners. If they are the same as in my photos, already worn out, then change them to red ones from the 6.2 4th generation. They fit more tightly, have less gap, and resist oil starvation more

 

[cornicekurt]

I carefully monitor the bearings of the trailer)) and change them regularly))

You’re a good man. Thank you for the time you took to share this with us.

 

[cornicekurt]

Because business is above sanctions, lol. In general, we have no problems, neither with buying a car in the USA and delivering it to Russia, nor with spare parts. 4 weeks and any spare part is at my home. Yes, it has become more difficult, more expensive, and a little longer. But in general, these are surmountable difficulties. Look, as it turned out, replacing the engine for me in time is much faster than for the owner of the Yukon in the USA)

Wow, sorry for your troubles with this engine. I’m waiting for General Motors to execute the recall on my 2023 Denali with only 17,000 miles.
I now feel they will say everything is fine and give me a 0W-40 oil change and send me on my way.
I now plan to demand an extended warranty or a vehicle by back!!!

I’m hearing rumors they’re going to extend the engine warranty out to 150k. I’m not sure I’ll be happy if it blows at 150 since every other vehicle I’ve owned has run strong well past200

 

[Vladimir2306]

A new day has come, the engine has come from processing, now they have begun to assemble it, having previously replaced the liners with red ones from the 4th generation, checking the gaps and observing the standards for tightening the joints.