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Thicker Viscosity oil for GM ENGINES ???

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steve(ill) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Topic: Thicker Viscosity oil for GM ENGINES ???
    Posted: 28 Apr 2025 at 4:28pm
A dealer bulletin obtained by GM-Trucks forum users, all affected units (MY2021-2024) are currently up for recall, including those in the inventory units. While the dealer bulletin only contains instructions for the dealers that will work on the trucks, GM has confirmed in a statement that it will be issuing a voluntary recall "to address this matter as quickly as possible."

Affected Models

Model Years

Chevrolet Silverado 1500

2021-2024

GMC Sierra 1500

2021-2024

Chevrolet Tahoe

2021-2024

Chevrolet Suburban

2021-2024

GMC Yukon

2021-2024

GMC Yukon XL

2021-2024

Cadillac Escalade

2021-2024

Cadillac Escalade ESV

2021-2024

There's A Remedy For Those That Pass Dealer Inspections

For the uninitiated, the L87 V8's woes lie in the connecting rod and/or crankshaft components in affected vehicles having unspecified manufacturing defects. When these components fail, it could lead to loss of propulsion or complete engine failure, which can be hazardous or even life-threatening if they occur while in transit. We've found several cases of this issue before, with some instances happening while on the highway, while others reportedly bombing as early as 4 miles.

2:GM has provided a remedy for the problem, although it's incomplete for now. The recalled vehicles will be checked by the dealers for diagnostic trouble code P0016. If it's not set, the vehicle in question passes the inspection but will have its oil replaced by 0W-40 high viscosity oil (replacing the former 0W-20). It will also be given a new oil filter and oil fill cap that reflects the change, as well as a section in the owner's manual for the new oil type. According to the documents shared, the thicker oil "offers an increased further level of protection."

Engine Replacements Could Happen, But...

On the other hand, those vehicles that will not pass the inspection will be "quarantined" and should not be sold/delivered to the customer. It's unclear what will happen to these vehicles, with the documents only stating that "Additional information will be provided by General Motors in the near future."



Edited by steve(ill) - 28 Apr 2025 at 4:31pm
Like them all, but love the "B"s.
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NEVER green View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2025 at 8:31am
  Wont help the lifter failures, did they ever recall that?
2-8050 1-7080 6080 D-19 modelE & A 7040   R50       
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steve(ill) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2025 at 9:03am
V8's woes lie in the connecting rod and/or crankshaft components in affected vehicles having unspecified manufacturing defects

--- but if it has not failed yet, they will put 40 wt oil in place of the 20 wt ..????
Like them all, but love the "B"s.
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Dave H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave H Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 2025 at 9:17am
God bless those engineers.  Confused  I am gonna stick with my Ferd (as I recall a famous person used to call them}] LOL
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Coke-in-MN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 19 hours 51 minutes ago at 1:58pm
Seems recall is on the 6.2 Gas V8 engines , not the 6.0 or other engines , 
to meet millage specs the light weight oil was the new grade to reduce friction , 
The old idea of heavy oil for longer life has changed in new engines .
10/30 for many years and now 0/20 seems to be the grade called for 
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Lars(wi) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 18 hours 5 minutes ago at 3:44pm
Is the lubrication problem with the cold oil at start-up, or thin hot oil?
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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steve(ill) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 17 hours 2 minutes ago at 4:47pm
THICKER oil is a good thing... but thats NOT what the complain says...

Manufacturing defects in the connecting rod and/or crankshaft engine components "can lead to engine damage and engine failure," according to documents posted Tuesday by the National Highway Traffic Safety Administration. 

The recall comes amid an investigation by U.S. auto safety regulators following reports of engine failure in GM vehicles, including the company's best-selling Silverado. The NHTSA in January said it was investigating an estimated 877,710 vehicles after receiving 39 complaints from users of GM vehicles equipped with L87 V8 engines.

Like them all, but love the "B"s.
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tadams(OH) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tadams(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 50 minutes ago at 7:59am
The ad I seen said they just stop running, could be in the middle of the road

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SteveM C/IL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 40 minutes ago at 9:09am
I heard they tend to break a rod and depending on position of things can lock engine. Happened to me 47 yrs ago when a 327 broke a rod bolt and came apart. Instant lock at 110 and the torque converter takes a while to decouple so rear tires sliding. Glad it was daylight and sober.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 2 minutes ago at 9:47am
lets be fair now back in the 327 days , they were all ran right to the point of the valves floating  and a few passes just out of town every saturday night  just be fore them black and white cars showed up to mess up the fun
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