New bulletin/Campaign 6.2 L87

[Andrew Martens]

Just got my truck back from the dealer. They did install all new injectors and they had to re-seal the oil pan. Said that the silicone at the rear of the engine was too thinly applied. They put on about 60 miles test driving it, then they took pictures and it does look dry now. 

Also, I was told that what they call “service”  replacement engines are remanufactured and NOT brand new. So only factory assembly line vehicles get new engines. 

[Byrds8]

Guess the recall against my truck was updated and now can be taken in. I think I'll wait a month or so since I just changed my oil. Might as well get my monies worth out of it lol.

[MrLeadFoot]

3 hours ago, Byrds8 said:

Guess the recall against my truck was updated and now can be taken in. I think I'll wait a month or so since I just changed my oil. Might as well get my monies worth out of it lol.

I was thinking the same thing, but then realized one of the issues is that we NEED higher viscosity for better protection against possibly too much friction, as well as reducing thermals, if only slightly in that regard. This is why GM is switching us to 40 weight oil, so the sooner the better. 

Edited May 16, 2025 by MrLeadFoot

[Byrds8]

 I already changed mine out to the 0W40 oil. I was due an oil change when all this started.

[customboss]

1 hour ago, Byrds8 said:

 I already changed mine out to the 0W40 oil. I was due an oil change when all this started.

Let us know if your mpg drops. 

 

https://stocks.apple.com/AqSrkECAlQQW9kiRALJRNPw

Edited May 16, 2025 by customboss

[Z45]

Seen this?

 

 

[PunchT37]

I put 5w30 in my new L84 at 600 miles. I took a vid of the engine idling with factory fill. Then, another with the 5w30. Fairly large difference in sound. Maybe a L87 guy could do the same?

[MrLeadFoot]

So, the PICO is looking for noise and vibration. Sounds like it's better NOT to have 0w40 in the motor when they do the test because the test was designed to listen while the much lighter 0w20 is in the motor! 

[Byrds8]

2 hours ago, customboss said:

Let us know if your mpg drops. 

 

https://stocks.apple.com/AqSrkECAlQQW9kiRALJRNPw

Nothing that I have noticed. Seems pretty on par IMHO. Granted this is going off the DIC as I stopped hand jamming the numbers a while ago cause I stopped caring lol. I saw more MPG drop from switching from 91 Oct no ethy to 93 Oct with. LOL

[Byrds8]

11 minutes ago, MrLeadFoot said:

So, the PICO is looking for noise and vibration. Sounds like it's better NOT to have 0w40 in the motor when they do the test because the test was designed to listen while the much lighter 0w20 is in the motor! 

Maybe. However, I am sure not switching it back just to do this test. The test can pass and they change my oil for all I care. At the end of the day, when any of them still go bad it's on GM to fix it. We all know it's a bandaid fix and the engines are already worn and WILL still go bad. They will say they did the recall and want to "investigate" again. Just further kicks the can. Luckily, I have a warranty until 99,950 miles. So Im good with it.

[WeGone]

2 hours ago, Z45 said:

Seen this?

 

 

Question is did they get the rumored 10 year 150K extended warranty?  

[BIGDOGx]

Lol I dont see how a listening devise is going to identify bearing failure. Listen to this engine, it sounds like a box of rocks as all 6.2's sound, I dont see how this device is actually able to filter all that noise out to identify a potential issue. We all know the correct way to check this is dropping the pan and physically inspecting the bearings to see if there is premature wear. At the extreme least, GM should be sending off oil samples from all inspected trucks to see if there is more then average bearing wear in the analysis.

Edited May 16, 2025 by BIGDOGx

[customboss]

6 minutes ago, BIGDOGx said:

Lol I dont see how a listening devise is going to identify bearing failure. Listen to this engine, it sounds like a box of rocks as all 6.2's sound, I dont see how this device is actually able to filter all that noise out to identify a potential issue. We all know the correct way to check this is dropping the pan and physically inspecting the bearings to see if there is premature wear.

BIGDOGx most large expensive equipment including turbines that has rotating gear and jet engines in flight uses tuned frequency vibration monitoring. Best indication of an engine failure inflight before it happens.  
 

So it makes sense to use it as a guide. Albeit late and another BANDAID 

Edited May 16, 2025 by customboss

[BIGDOGx]

2 minutes ago, customboss said:

BIGDOGx most large expensive equipment including turbines that has rotating gear and jet engines I flight uses tuned frequency vibration monitoring. Best indication of an engine failure inflight before it happens.  

A vibration test will not tell the whole story, some of these engines have a 1,000 miles on them and doubt all exhibit this issue the same way or at the same mileage. An inspection of the actual oil or bearing itself is the proper way to ensure all is fine or not fine. This pico scope is the half-ass way imo, but that's pretty much expected today by GM. I sure hope everyone will be getting that 150k/10 year extended warranty on the engine at the very least as it looks to me like GM is hoping they can limp enough of these over the coverage period.

[newdude]

2 hours ago, BIGDOGx said:

Lol I dont see how a listening devise is going to identify bearing failure. Listen to this engine, it sounds like a box of rocks as all 6.2's sound, I dont see how this device is actually able to filter all that noise out to identify a potential issue. We all know the correct way to check this is dropping the pan and physically inspecting the bearings to see if there is premature wear. At the extreme least, GM should be sending off oil samples from all inspected trucks to see if there is more then average bearing wear in the analysis.

 

1 hour ago, BIGDOGx said:

A vibration test will not tell the whole story, some of these engines have a 1,000 miles on them and doubt all exhibit this issue the same way or at the same mileage. An inspection of the actual oil or bearing itself is the proper way to ensure all is fine or not fine. This pico scope is the half-ass way imo, but that's pretty much expected today by GM. I sure hope everyone will be getting that 150k/10 year extended warranty on the engine at the very least as it looks to me like GM is hoping they can limp enough of these over the coverage period.

 

 

Picoscope is a rather impressive tool.  Its ability to diagnose vibrations is impressive as well.  An oscilloscope on steroids.  You can even do a form of cranking compression testing with it before even pulling every single plug one by one and hooking a gauge up.  

 

Their method seems to be an ok approach here.  Why just shotgun BILLIONS of dollars into replacing 700,000 engines right out of the gate if not every single one will fail?  They'd be facing bankruptcy over this and or will have a really major cost cutting approach that won't involve cutting CEO salary, rather affect vehicle quality and plant workers and maybe corporate white collars being axed.  And those that pass the test, extend the warranty IF it were to fail down the line.  

 

 

2 hours ago, customboss said:

BIGDOGx most large expensive equipment including turbines that has rotating gear and jet engines in flight uses tuned frequency vibration monitoring. Best indication of an engine failure inflight before it happens.  
 

So it makes sense to use it as a guide. Albeit late and another BANDAID 

 

Edited May 16, 2025 by newdude