BREAKING: GM is officially recalling the L87

[viven44]

Yeah its 43 pages of nonsense. In the beginning we said it wasn't oil and here we are 40 pages later lmao.

You are welcome to keep reading, lol... obviously you are reasonably entertained like the rest of us...

 

[NoYukonYet_1Jeep]

Dude you need to relax. Toyota just had a huge engine recall on tundras and most people don't know and don't care.

Most people won't break down from this. Most people will never have an issue. And Most people will get theirs fixed before any issues.

The fix is in. Step 1 is admitting the problem and now step 2 is correction.

You guys are going on and on about things you have no idea about.

lol, seriously. Only 44 pages so far. Keeping up with this feed is becoming a part time job. Wish there was a mod who could limit responses to a few sentences. Despite all 44 pages of this and 850k deep recall, I still love my Yukon Denali.

 

[NoYukonYet_1Jeep]

I have yet to see an instance of a failure in this pseudo venn diagram:

greater than 5,000 miles, less than 90,000
2021-2024 range
Oil changed before 5000 miles, even with 0w20
Higher viscosity oil used, with any oil change interval, since first oil change
DFM disabled all or most of the time
Auto start stop disabled all or most of the time
Frequently driven more than 30 minutes in single instance

The closest (and it is very close) is Firetrout's 6.2 failure at 27,000 miles:

Yukon Engine Failure - Buyback?

Have lots of questions if you would be willing to answer. Trying to get an understanding of the engine failures that occur after 7500 miles. If you would be willing to answer the following questions it would be helpdful. 1. What City/State do you live in? Need this info to understand the...

www.tahoeyukonforum.com

(I'm leaving out the engines that failed before first oil change. Those are something else entirely. Likely both debris and out of spec crankshaft or another failure mode (wrist pin?) that is statistically guaranteed to show up due to the volume of engines GM puts out.)

^This is one of the most noteworthy comments on the entire chain. Thank you.^
My concern is my resale / trade in value (I’m at 33k on my 2nd 2023 Denali - first motor blown 3.6k miles, then did full vehicle replacement) when I get up to 60-80k area. Basically be driving around a paper weight at that point unless GM wants to entertain a trade/ buy out. I’ll be tuned in to any folks going the class action / lemon law route. I’m in CA, so think the law does lean my way if I’m keen.

 

[Antonm]

Actually tried comparing the specifications of the LT1 vs the L87 on several different websites,
like

LT1 6.2L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More

Learn all about the Gen 5 6.2L LT1 engine, including LT1 horsepower, LT1 engine specs, history and much more!

www.onallcylinders.com

L86 6.2L EcoTec3 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders

The L86 is a Gen. 5, 6.2L, small-block engine powering 2014-present GM trucks and SUVs. They are known as the EcoTec3 6.2L engines. These engines use a longer intake runner than its …

www.onallcylinders.com

So far, only differences I can find are:
6600 vs 6000 redline (which can be as simple as a difference in the GM OE tune)
different intake manifolds for 'vette vs trucks / SUVs

To be clear: I can't find any other differences in the hardware specs.
Nearly everything is the same, including the pistons, cam, heads, valvetrain,
static (and thus dynamic) compression (again, possible differences in the GM OE tunes)

The good news IS the bad news here, I guess?:
An L87 IS an LT1, except with a different intake manifold and a slightly lower redline.

Yeap, the lower end/ rotating assembly is the same between the corvette and the truck 6.2,,, yet GM has spec’d 0W40 in the corvette from the beginning,,,, because well, that’s how CAFE standards work

CAFE stands for “ corporate average fuel economy “ so you can make a small number of cars and not really care because it won’t hurt the overall corporate average that much,,,but the vehicle you sell a bunch of,,, oh that one you care about every 0.01 you can get because a little adds up quick when you sell hundreds of thousands of them.

The thin oil was a compromise from the beginning to get a little extra CAFE credit. GM knew this, but really they are forced into a bad spot where they have to make the CAFE number to stay in business.

All the internet keyboard warriors saying how it’s not the thin oil,,, okay, so tell me again what the downside of running a thicker oil is??

What 0.1 mpg loss maybe and that’s it. Literally no other negative or downside yet y’all still want to run 0w20. Have fun with that.
…

 

[Marky Dissod]

Yep, the lower end / rotating assembly is the same between the corvette and the truck 6.2L ...

Same upper end too. Check the specs again -
same cam, pushrods, rockers, valves & springs, same heads, same compression ratio.
ONLY hardware difference between the LT1 & the L87 is the intake manifold. THAT'S IT.

 

[viven44]

So is the upper end. Check the specs again - same cam, pushrods, rockers, valves & springs.
ONLY hardware difference between the LT1 & the L87 is the intake manifold. THAT'S IT.

Thanks for checking that. I have been comparing part #s on RockAuto mainly and the only actual difference I can find is the intake manifold and the cam. The Corvette cam has a bit more exhaust duration to enhance higher RPM characteristics... all others (springs, lifters, pushrods are the same as you said).

The crank part # is different as well per RockAuto but not able to tell what is different.... but they are pretty darn close an engine as you'd ever expect vastly different applications to have. The differences in the crank could honestly just be flexplate/balance related.

I'm expecting a 2024 mid-year change in the crankshaft part # for the truck 6.2L. Rockauto won't even show part numbers for the trucks in 2024, 2025, whereas it does show it for 2021-2023 truck 6.2L and 2021-2025 Corvette 6.2L.

 

[NoYukonYet_1Jeep]

Yeap, the lower end/ rotating assembly is the same between the corvette and the truck 6.2,,, yet GM has spec’d 0W40 in the corvette from the beginning,,,, because well, that’s how CAFE standards work

CAFE stands for “ corporate average fuel economy “ so you can make a small number of cars and not really care because it won’t hurt the overall corporate average that much,,,but the vehicle you sell a bunch of,,, oh that one you care about every 0.01 you can get because a little adds up quick when you sell hundreds of thousands of them.

The thin oil was a compromise from the beginning to get a little extra CAFE credit. GM knew this, but really they are forced into a bad spot where they have to make the CAFE number to stay in business.

All the internet keyboard warriors saying how it’s not the thin oil,,, okay, so tell me again what the downside of running a thicker oil is??

What 0.1 mpg loss maybe and that’s it. Literally no other negative or downside yet y’all still want to run 0w20. Have fun with that.
…

There was a decent YouTube video posted like 60 pages ago, on this thread - but my takeaway - and pls mind my half mechanical jargon was that the thicker oil *could* impact the operation of the dynamic fuel mgmt (DFM) system, I’m guessing potentially causing lifters to fail quicker? I thought Vlad had some decent commentary on this and how you’re driving / speed / engine warm ups / climate / remote starts - there’s a lot to the story - not to mention how often your oil changes are and how low you let the OLM go(oil limit thing - I really don’t go under 40%). I’m sticking with 0w-20 for now, but I do check my oil frequently now (thanks GM!), and top off whenever necessary. Case of oil is now a staple in my trunk. I’m also in the camp of ‘if my engines going to fail, I’d like it to happen sooner than later’ , while this recall is fresh and parts might be available, vs 2-3-4 years down the road.

 

[2024 White Tahoe]

There was a decent YouTube video posted like 60 pages ago, on this thread - but my takeaway - and pls mind my half mechanical jargon was that the thicker oil *could* impact the operation of the dynamic fuel mgmt (DFM) system, I’m guessing potentially causing lifters to fail quicker? I thought Vlad had some decent commentary on this and how you’re driving / speed / engine warm ups / climate / remote starts - there’s a lot to the story - not to mention how often your oil changes are and how low you let the OLM go(oil limit thing - I really don’t go under 40%). I’m sticking with 0w-20 for now, but I do check my oil frequently now (thanks GM!), and top off whenever necessary. Case of oil is now a staple in my trunk. I’m also in the camp of ‘if my engines going to fail, I’d like it to happen sooner than later’ , while this recall is fresh and parts might be available, vs 2-3-4 years down the road.

Why would you carry a case of oil in your trunk?

 

[Stbentoak]

Yeah its 43 pages of nonsense. In the beginning we said it wasn't oil and here we are 40 pages later lmao.

The 1st few pages of this thread only about a week ago was SURE is was the thin oil.....

 

[jfoj]

Here are images of the full GM N252494002 bulletin so this looks like the real deal, something will likely either be updated or posted on the NHTSA site next week.

In short vehicles with engines built BEFORE July 1, 2024 require an engine replacement.

Found on Reddit

N252494002 Page 1

N252494002 Page 2

N252494002 Page 3

N252494002 Page 4