BREAKING: GM is officially recalling the L87

[viven44]

Have the dealer change the oil, then pull the drain plug and put what you want in the engine. Hell even the Costco Kirkland Synthetic oil is good and cheap. Again, oil is cheaper than steel.

Its not really ALL about the warranty. I don't want to waste any time on it as its not mine, and I'm certainly not in the mind to do any favors for the future owner (I have been down this path many times.. and sadly the new car smell wears off soon and its time to upgrade, haha). But I've been told this one is to keep.... I'd rather hedge my bets on not doing anything now, and potentially replacing stuff later. Maybe find a parts/wrecked truck with the 6.6L and swap down the line. Fortunately GM is good with bellhousing compatibility, etc across platforms.... (all of mine are the blue oval variety and bellhousing compatibilty sucks for swaps, etc...)

 

[viven44]

Something else besides programming and shift points and oil is adrift. 6.2 is in the 2020 pickups, with the 10L80 and the DFM. Those weren’t in the recall or the blowing rod bearings or crank bearings lore…

DELETED

Update: Nevermind I read your statement wrong.... 2020 trucks only... yes that is strange..... 2020s should also be covered if there were no differences, but evidently there may be differences.

Good observation

 

[Marky Dissod]

The owner’s manual for L87-equipped models calls for 0W20.

In the USA, bound by CAFE MpG regulations, yes.
However:
What is the motor oil spec for L87 equipped vehicles OUTSIDE the USA (not subject to CAFE MpG testing)?
What is the motor oil spec for Corvettes with LT1, LT2, LT4, LT5?
What is the motor oil spec for L8T equipped vehicles?

I'd imagine a truck would certainly be given all the leverage it needs to move the family,
and some load in the bed, vs. a family hauler ... but I haven't driven one to know if that is true.

CAFE MpG testing very strongly induces GM to program upshifts to happen as early as possible, and to delay downshifts.
Given identical axle(s) gearing, with identical 10L80s, GM would very likely upshift the 6.2L before the 5.3L,
effectively lugging the 6.2L compared to the 5.3L in identically 'conservative' driving conditions.

Not crazy enough to suggest that the simple fix is to drive with the Tow / Haul shift schedule enabled,
even though it would lug the 6.2L less than the Normal shift schedule.

Too bad it's so hard to tune L87 vehicles ...

 

[jfoj]

Something else besides programming and shift points and oil is adrift. 6.2 is in the 2020 pickups, with the 10L80 and the DFM. Those weren’t in the recall or the blowing rod bearings or crank bearings lore…

The pickups were lighter by close to 1000 lbs in some configurations. But I am sure there were many small changes from 2020 to 2024 to include ECM and TCM tuning as well. Interesting looking at the fuel economy is about 1 MPG lower on the 2024 Yukon 4WD with the 6.2l than the 2020 GMC Sierra 4WD. Again, probably weight difference, which would also require a different level of torque on the highway.

The other MAJOR factor is how the vehicles are used. I have seen this situation repeated many times over. The Tahoe/Suburban/Yukon/Esclade was usually a people/kid haulers. Often these may be driven by the "Wife/Mom" to haul kids to a from school, sports events, appointments and so forth. Often the vehicles are used either for many short trips and/or have stupid idle time for either warm up in the Winter, staying cool in the Summer or just waiting in carpool lines or in the car during sporting events. The short trips kill the engine oil in these engines with fuel and moisture. I also think these engines are often chronically run low on engine oil due to oil consumption. The low oil light typically does not come on until 2 quarts low on oil. The less oil in the crankcase, the faster is gets to a higher contamination level. I have logged that it takes the engine oil 30 minutes of driving to warm up in temps even in the 45F range.

Then the pin on the grenade is often when Spring Break or vacation time comes around, the car is loaded up and head off on a long trip, then the grenade goes off! So many of the 6.2l bearing failures have been at highway speed.

You typically do not see the pickups used as much as kid haulers. So I think a lot of what we have seen on failed engines tend to be more SUV's rather than trucks, at least this is what I have been reading.

 

[WalleyeMikeIII]

But,

The pickups were lighter by close to 1000 lbs in some configurations. But I am sure there were many small changes from 2020 to 2024 to include ECM and TCM tuning as well. Interesting looking at the fuel economy is about 1 MPG lower on the 2024 Yukon 4WD with the 6.2l than the 2020 GMC Sierra 4WD. Again, probably weight difference, which would also require a different level of torque on the highway.

The other MAJOR factor is how the vehicles are used. I have seen this situation repeated many times over. The Tahoe/Suburban/Yukon/Esclade was usually a people/kid haulers. Often these may be driven by the "Wife/Mom" to haul kids to a from school, sports events, appointments and so forth. Often the vehicles are used either for many short trips and/or have stupid idle time for either warm up in the Winter, staying cool in the Summer or just waiting in carpool lines or in the car during sporting events. The short trips kill the engine oil in these engines with fuel and moisture. I also think these engines are often chronically run low on engine oil due to oil consumption. The low oil light typically does not come on until 2 quarts low on oil. The less oil in the crankcase, the faster is gets to a higher contamination level. I have logged that it takes the engine oil 30 minutes of driving to warm up in temps even in the 45F range.

Then the pin on the grenade is often when Spring Break or vacation time comes around, the car is loaded up and head off on a long trip, then the grenade goes off! So many of the 6.2l bearing failures have been at highway speed.

You typically do not see the pickups used as much as kid haulers. So I think a lot of what we have seen on failed engines tend to be more SUV's rather than trucks, at least this is what I have been reading.

this logic is OK, but still does not explain leaving 2020 off the recall. The defect is the engine…same thing in the trucks as the SUV…maybe there was not a foreign bearing supplier in 2020.

 

[Vladimir2306]

So do your research, the 4.8l V8 which is the same platform as the 5.3l and 6.2l without the DFM is/was spec'ed from the beginning to use 5W30 oil. The 4.8l was a small percentage of sales mainly in the work vans and some other vehicles so I do not thing GM had a large percentage of the 4.8l factoring into the CAFE equation.

As for the "Recall" I would not wait on anything from the dealer, the only thing you might get is a free oil change, but I have to read everything over carefully to see if vehicle already sold get oil and filter or just the oil fill cap and maybe a sticky piece of paper to put in the undersized paper owners manual.

Additionally, I have a 2024 that should be part of this recall and I have checked a number of times and my VIN does not show any recalls. I think GM may have close to 1 million VIN's to process and it may take time to get the data processed and uploaded.

The 5.3l and 6.2l are effectively the same engine. If I owned one, I would not be running 0W20 in the 5.3l. The ONLY reason 0W20 oil was ever spec'ed was for miniscule fuel economy improvements, not for engine durability. The ONLY reason the 5.3l engines have not seen the same failure rate of the 6.2l is the 5.3l DOES NOT HAVE THE TORQUE OUTPUT THE 6.2l HAS. The TCM keeps the 6.2l HEAVILY loaded up at highway speeds on slight and medium grades with the engine power/torque output continuously between 70%-100% engine load in the 1500-1700 RPM range. The engine is "lugging" and putting TREMENDOUS load on the rod bearings. Additionally if DFM is operating under 4 cylinders, again, TREMEDOUS loads are being put on the rod bearings. Add fuel to the oil and you are screwed!

TLDR - DO NOT RUN 0W20 oil in any V8 or Diesel engine from any manufacturer if you expect the engine to last more that 15-30k miles. Change the oil every 3500-4000 miles or on a GM target about 50% of the OLM and see if it falls in the 3500-4000 mile range. Oil is cheaper than steel! Dealers rarely even check the oil level on failed engines and I have never seen them pull an oil sample for analysis. The dealer will have no idea what you had in your crankcase. If you are worried, buy the 0W20 oil, copy/save the receipt and return the 0W20 oil and run the oil that needs to be in a working engine.

Then why does 5.3 on 0-20 oil drive without problems, and 6.2 wears out the connecting rod liners