2024 GMC Yukon (part of recalled engines) Various Oils, Total 7.1k mi

[AEHaas]

This “new” GMC Yukon XL Denali is a little over a year old. It has just over 7,000 miles now. FYI it is part of the GMC Recall for engine rod bearing failures thought to be from improper hardening. I hear the failure rate and engine replacement rate is somewhere around 5%. Otherwise they are now recommending changing the OEM recommended oil from a 20 grade to a 40 grade, specifically 0W-40. If the original engine “passes” the test then the engine does not need to be replaced, rather the owner is to use 0W-40 oil instead. If the engine has to be replaced then the original 0W-20 oil is to be used in the “new” replacement engine.

I did not know about the recall until I reached around the 4,000 mile mark on the truck. I ran the OEM oil for 2,000 miles then got a UOA (drawn from the oil stick tube). I changed the oil filter at that time to a Wix oil filter. The OEM oil was run another 2,000 miles, total 4,000 on the truck and the oil. This was the second UOA.

I changed the oil for the first time at the 4,000 mile mark to Renewable Lubricants 0W-20 oil and the filter was changed to a Motorcraft oil filter left over from my Lincoln Navigator days. I opened up the Wix filter and felt the debris was lower than normal for the milage. I was happy with this engine and felt it would last well. The engine used no oil.

I ran another 2,000 miles and got a UOA from the oil dip stick tube again. I got another UOA when I changed this 0W-20 RLI oil at the 3,000 mile mark, 7,000 total miles on the truck.

The oil now is RLI 0W-30. I got a UOA after just 100 miles, 7,100 miles on the truck.The object was to calculate the residual oil in the engine after an oil change. In any case, no indication from UOA that my engine is hurting.

ali

 

[PontiacHO]

Use whatever you like. The manufacturer’s flaw wont be fixed with just oil.

 

[fantastic]

From the samples it looks great! No real indication as you see as well. I will ask did we figure out why the spike of Sodium on the RLI 0w-20? Was that the additive pack? You reminded me that I need to add whether the filter/oil was changed on my spreadsheets to make it easier to read.

 

[Ursatdx]

I probably wouldn't be happy without a new engine but...
Would I want anyone taking my new engine apart?
10 year 150k mile warranty (free) might make the decision easier.

 

[burbguy82]

A better oil than 0w20 in a 8k lbs vehicle cant hurt.

I would run 0w40 and let it fly..........if they dont replace your engine, at least you have done the max you can do. Maybe you got a good one

 

[dnewton3]

IMO it's premature to call this a "good" engine yet.
It'll be a bit hard to tell break-in from real defect wear for a while.
Run a few more OCIs and watch for trending.

 

[AEHaas]

'Looking at the 100 mi sample shows that 15-20 percent of the previous oil is left behind during an oil/filter change. The actual wear metals should be reduced by that amount for a more accurate value.

Looking at the 3,000 mi. 0W-20 RLI value: The 11 ppm of iron should be reduced by say 5 giving an actual value of 6, or 2 ppm Fe/1,000 miles at this stage of break in.

ali