New bulletin/Campaign 6.2 L87

[Snow White]

On 8/2/2025 at 5:58 PM, customboss said:

it’s apropos  to L87 issues. 
key takeaway :  

FRICTION ≠ WEAR 

use great oil analysis from @Black02Silverado

 

Lake Speeds SPEEDDIAGNOSTIX is not giving enough FTIR data for the cost. 

the methodology rotating disc method RDE at speed diagnostix is superior to ICP method.  you get what you pay for.

[WeGone]

So here is a question on the effects or the failure of the bearings and how one might tell if they are getting close to the failure point.. As of the last few thousand miles I had noticed my truck was getting slow to start, So I replaced the battery thinking 4 years old sits for a few weeks at a time change battery. No Change in issue.

I went on a trip last week 1400 miles starter always spins fast first start up on a cold start.  Thru the trip on hot starts was like the started was dragging but it always started Ran fine good oil pressure. Could this be an indicator of trouble to come?

[customboss]

11 hours ago, Snow White said:

the methodology rotating disc method RDE at speed diagnostix is superior to ICP method.  you get what you pay for.

The difference of rotrode vs ICP is particle size capability not accuracy. No FTIR no way to see combustion dynamic. You DO get what you pay for. What are you paying ? 
At least you get some inside look. 

[66ss3964spd]

2 hours ago, WeGone said:

I went on a trip last week 1400 miles...

I would guess "no". If a bearing had been starting to go prior to your trip, 1400 miles would have almost certainly done it in.

[MrLeadFoot]

3 hours ago, WeGone said:

So here is a question on the effects or the failure of the bearings and how one might tell if they are getting close to the failure point.. As of the last few thousand miles I had noticed my truck was getting slow to start, So I replaced the battery thinking 4 years old sits for a few weeks at a time change battery. No Change in issue.

I went on a trip last week 1400 miles starter always spins fast first start up on a cold start.  Thru the trip on hot starts was like the started was dragging but it always started Ran fine good oil pressure. Could this be an indicator of trouble to come?

That is odd. Sounds like something is getting too hot. A mechanical engineer I know said the reason they are switching to thicker oil is because they are afraid of heat. Not trying to scare anyone, but the failures haven't been sudden. They take time to develop. That's why many have had thousands of miles on them before giving up the ghost.

 

Good news, in your case, is that it seems to run fine once started. If it were bearings starting to seize, it would continue to "drag", to say the least, once it's running. If it hasn't seized and it the bearings have spun, you would certainly know it. Maybe the starter is getting too hot and binding? How many miles on your truck? 

Edited August 26, 2025 by MrLeadFoot

[WeGone]

4 minutes ago, MrLeadFoot said:

That is odd. Sounds like something is getting too hot. A mechanical engineer I know said the reason they are switching to thicker oil is because they are afraid of heat. Not trying to scare anyone, but the failures haven't been sudden. They take time to develop. That's why many have had thousands of miles on them before giving up the ghost.

 

Good news, in your case, is that it seems to run fine once started. Maybe the starter is getting too hot and binding? How many miles on your truck? 

 

Only 17K miles have changed to 40w oil about 2k ago. have not received the recall part 2 yet.

[MrLeadFoot]

3 hours ago, WeGone said:

 

Only 17K miles have changed to 40w oil about 2k ago. have not received the recall part 2 yet.

Wow, you don't even drive that thing! I wouldn't think a starter is already worn out to the point it's binding up, but then again, stranger things have happened. But, sure sounds like battery or starter, to me. I would first double check that that new battery is indeed the right amperage and that it is not old, or something. 

 

At least you'll know if it's recall related once you get inspected. I would think they would detect somethimg with the pico test with your symptoms, if it is recall-related. 

 

FWIW, I just got my notice to get inspected, so maybe yours will come soon. 

[Black02Silverado]

On 8/26/2025 at 8:33 AM, WeGone said:

So here is a question on the effects or the failure of the bearings and how one might tell if they are getting close to the failure point.. As of the last few thousand miles I had noticed my truck was getting slow to start, So I replaced the battery thinking 4 years old sits for a few weeks at a time change battery. No Change in issue.

I went on a trip last week 1400 miles starter always spins fast first start up on a cold start.  Thru the trip on hot starts was like the started was dragging but it always started Ran fine good oil pressure. Could this be an indicator of trouble to come?

I wouldn't think so. To me it's a starter issue if you replace the battery with  an equivalent CCA one as you took out.  Starters seem to last anymore but there are times that you could have gotten one that is subpar and is going bad and possibly not liking getting heat soaked. Which could cause the slow start.  Make sure to check all your grounds as well. One or so could be loose.

[WeGone]

2 hours ago, Black02Silverado said:

I wouldn't think so. To me it's a starter issue if you replace the battery with  an equivalent CCA one as you took out.  Starters seem to last anymore but there are times that you could have gotten one that is subpar and is going bad and possibly not liking getting heat soaked. Which could cause the slow start.  Make sure to check all your grounds as well. One or so could be loose.

 Issue never changed same with old and new battery. One other thing I noticed was my volt gauge for the last 4 years was always at 14v, The last few months after starting it is a 14v then drops down to 13.8..13.5v.  Even at night running lights...

Edited August 27, 2025 by WeGone

[GETGONE]

3 hours ago, WeGone said:

 Issue never changed same with old and new battery. One other thing I noticed was my volt gauge for the last 4 years was always at 14v, The last few months after starting it is a 14v then drops down to 13.8..13.5v.  Even at night running lights...

The alternator is computer controlled and charging goes on and off based on needs and battery voltage. It's not always putting out a constant voltage. It's in the owners manual. If you use the auto-stop-start deal that has always been a concern that that will wear out the starter faster over time constantly restarting the engine vs just leaving it running.

[BIGDOGx]

Man stop sales all up and down the GM lineup right now!

[WeGone]

18 hours ago, GETGONE said:

The alternator is computer controlled and charging goes on and off based on needs and battery voltage. It's not always putting out a constant voltage. It's in the owners manual. If you use the auto-stop-start deal that has always been a concern that that will wear out the starter faster over time constantly restarting the engine vs just leaving it running.

Sorry to get this thread side tracked...My concern was hard start when hot..

[MrLeadFoot]

3 hours ago, WeGone said:

Sorry to get this thread side tracked...My concern was hard start when hot..

Understandable why you posted your initial question on this thread. That said, maybe you should start a new thread. That way your issue doesn't get lost like it might on this recall thread. A new thread might also attract the attention of someone who had a similar situation as you and has a sound resolution. 

 

In the meantime, @Black02Silverado has a good suggestion about checking grounds, as that would indeed cause the same symptoms. He's also correct about today's starters, espcially those designed with auto-stop functionality in mind. Those are specifically designed for super-long duty cycles, with auto-stop frequency factored in. But, starters don't like heat. I remember long ago, an exhaust manifold pipe on one of my cars got so hot I would get the same symptom you're getting. A thermal wrap solved it. I doubt that's your problem, just offering a point of reference.

 

I've also had vehicles where the nut on the power post on the starter was not as snug as it should be, and the weak power connection got the same symptom. Kind of like when your battery terminal isn't completely snug, and it causes the starter to struggle on its initial turn.

 

Finally, I've also has starters do what you describe, but they were all super old, and eventually locked up after some time. Since yours is so new, I would check ground and other electrical connections before going after the sarter. It's always a party when you find something as simple as a loose nut.

[ExYukon]

One more data point....I got my inspection yesterday, it said the engine is OK.  This is a 2023 Silverado 1500, manufactured in Dec. 2023.  28,000 miles, 12,000 towing a 7K pound travel trailer.

[MrLeadFoot]

I should add mine, too. Yesterday. 22 Sierra, 30,500 miles.