BREAKING: GM is officially recalling the L87

[Scarey]

The oil pressure may be slightly higher however I think the variable displacement oil pump design may modulate the pressure a bit. With 0W40 in my engine at idle around 35 PSI, while cruising around 1600 RPM about 45 PSI. The problem I feel with the 6.2l is 0W20 may not hold up to higher heat well before it thins out on long highway runs. One the oil starts to warm up over 212F/100C the HTHS starts to drop, then you have a vicious cycle. Once the oil starts to thin, less protection and probably more heat generated.

I personally see nothing good coming from 0W20 a High Torque, lower RPM engine operation propelling 6000+ lbs vehicle.

At a stop light I see 15-20psi and cruising about 45-50.

 

[Stbentoak]

How did I not think about this before?
Genius

I drive mine up on ramps. I don't trust my life on a valve that could fail or change its mind while I'm under it.....

Also I see this fuel dilution mentioned quite a bit, but every single oil analysis I've seen posted gas or diesel, refutes that. If that's such a big deal post up a few analyses that show excessive fuel dilution....

 

[Vladimir2306]

I drive mine up on ramps. I don't trust my life on a valve that could fail or change its mind while I'm under it.....

Also I see this fuel dilution mentioned quite a bit, but every single oil analysis I've seen posted gas or diesel, refutes that. If that's such a big deal post up a few analyses that show excessive fuel dilution....

I have already written about this several times, there is no dilution of oil with fuel. Oil tests confirm this, moreover, we have a sensor for the presence of fuel in the oil on the engines, it would begin to swear if fuel standards are exceeded

 

[DuraYuk]

Interesting with all the talk about fuel dilution, your's was less than 0.5%. Go figure.

It's because there's a lot of 'i feel' in this thread and almost no 'i know'

 

[BacDoc]

It's because there's a lot of 'i feel' in this thread and almost no 'i know'

This is true!

Maybe a new thread on common denominator for 6.2l failure.

So far, after reading a lot about this the only thing I have seen is most failures are at highway speeds over 50mph. Is this correct?

I would like to know if anyone with a DFM disabler like Range, Carbyte etc has had a failure.

If there is a thread on this please link it as I would like to see the actual history of the failures.

 

[viven44]

All we know is that if/when the failure happens on a 21-24 built engine its catastrophic and isn't progressive

and

GM believes that the thicker oil will prevent this catastrophic event from happening

so, this whole oil debate is pointless, for your own safety just switch to 0W-40 on the 6.2L as GM has said that's the way to go on most if not all of the engines manufactured from 21-24 and still on the road... all the 0W-20 believers apparently know more than GM

 

[mummer43]

This thread has gone in a bunch of different directions but I will ask the question here rather than start a new one. Has GM issued an official remedy yet? Im taking my 24 Yukon in for service in on 5/23 and the service manager led me to believe that I will have to pay for the 0W40 oil unless there is an official remedy by then. Has anyone else had any communication with their service department or received any more definitive information?

 

[blanchard7684]

This is true!

Maybe a new thread on common denominator for 6.2l failure.

So far, after reading a lot about this the only thing I have seen is most failures are at highway speeds over 50mph. Is this correct?

I would like to know if anyone with a DFM disabler like Range, Carbyte etc has had a failure.

If there is a thread on this please link it as I would like to see the actual history of the failures.

I've been watching for this as well.

By my observation I have yet to see a failure from a category of what I'd call "enthusiasts".

People who change their own oil
Change it often
Use a dfm disabler
Defeat auto start/stop

 

[blanchard7684]

All we know is that if/when the failure happens on a 21-24 built engine its catastrophic and isn't progressive

and

GM believes that the thicker oil will prevent this catastrophic event from happening

so, this whole oil debate is pointless, for your own safety just switch to 0W-40 on the 6.2L as GM has said that's the way to go on most if not all of the engines manufactured from 21-24 and still on the road... all the 0W-20 believers apparently know more than GM

Vladimir's failure makes me think there is more failure modes than just the out of spec crank and rods. in other words, failure modes where infinite viscosity would not save the engine.

 

[viven44]

Vladimir's failure makes me think there is more failure modes than just the out of spec crank and rods. in other words, failure modes where infinite viscosity would not save the engine.

I'm not sure yet....

Vladimir thinks it couldn't be the oil viscosity because it happened so quickly... but that just how bearing failures occur..... it didn't help at all that he had the cruise control on, so the RPM was increased when it shouldn't have been

Looks like all those bearing clearances were suspect to begin with, and we know the bearing clearances increase as the engine ages, and all it takes is a singular event where the worst bearing was "breached" and that caused oil to heat up enough, and thin out further than it would normally, and the next worst bearing getting "breached", and so forth... all of this can happen quite suddenly as well if the oil heats up enough, mimicking an oil pump failure which I believe is what Vladimir thinks happened as he says "It seems to me for some reason, the oil pump abruptly stopped giving oil"