BREAKING: GM is officially recalling the L87

[mummer43]

Not that I have anymore information than anyone else, but I would say, don't wait for the "free" oil change. If GM starts sending out letters in early to mid June, that is still at least a couple weeks from now. And I think some of said on here that it likely will happen in waves (ranges of VINs or however GM will do it), so it may not mean that you get a letter Day 1 and will be able to immediately bring it in for inspection. Seems like this will take some time. In my opinion, better to care for your vehicle now the best you can.

Yeah I suppose you are correct. I'm wondering if I should tell them to put 0W40 in it.

 

[jfoj]

Post your mileage before the switch if you are implying you didn’t lose 2mpg with the switch.

Here is the problem, 0W20 went out of my engine at 544 miles and I do not have any screen shots from this point in time. I also have had the Auto Stop/Start and DFM disabled since 275 miles.

The 20.8 MPG was also with 3 adults and a fairly packed cargo section. The route I took was fairly flat with some decline in altitude because I ended up at Sea Level, so there clearly is an advantage due to the terrain. It is also a function on how aggressively I drive with my right foot and how many trucks and rolling roadblocks I need to dispatch.

The EPA Highway rating of my 6000 brick is 18 MPG, 14 MPG City and 16 MPG Combined.

Assuming 2 MPG hit for 0W40 oil and disabling the Auto Stop/Start and DFM, I guess I should be getting close to 26 MPG on the highway based on the way some people think around here. Not going to happen in one of these vehicles.

There is absolutely NO 2 MPG hit running 0W40 vs 0W20, might be 0.1-0.2 MPG at the highest. Someone here posted this 2 MPG non-sense, they just pulled that number out of their backside.

The EPA and manufacturers would have been running 0W20 25 years ago it they could get 2 MPG with just a oil viscosity change.

Not sure where people dream up these ideas.

I really do not care what my fuel economy is, I am not trying to for the highest fuel economy, I am trying to get my engine to last more than 50k miles. Durability and reliability is far more of a concern that what is spent on fuel. Regardless of what I drive with an ICE power plant, I will be spending money on fuel.

Here is a shot of me Hypermiling in town with a slight decline in grade going no faster than 45 MPH. 9 minutes, distance 4.9 miles. This truely was a bit of Hypermiling because I was spending a fair amount of time in DFCO (Decel with Fuel Cut Off). 24 MPG, gotta love this, but the moment I need to climb a grade, this story is over!

 

[Scarey]

Price of oil change is insignificant. Change it. Better yet, take this opportunity to change it yourself and put in 0-40. Contrary to popular belief, there are no 0-40 police trying to void warranties.

 

[jfoj]

Hello!!!! Please forgive me I have not read this whole thread but have a question on warranty for the experts here:

I have a ‘21 Tahoe and a ‘21 Silverado, both with 6.2s and have had zero problems, but am concerned obviously. With the new extended warranty being issued for rods, I assume we will get coverage for lifters by default? It would be a standard powertrain warranty that would cover all lubricated parts just like the regular pt warranty? Not limited to just rod/bearing issues?

My wife’s Tahoe is at 58k and my Silverado is at 91k….a pt warranty to 150k would drastically alter when I replace these trucks. Thanks in advance!!

Have your vehicles been recalled?

I believe the problem engine build window is from March 1, 2021 to June 30, 2024.

So even if you have a 2021 model year vehicle, your vehicle(s) may not fall under the recall.

Only engines within the problem build window that have "Passed" the test procedure and are converted to 0W40 engine oil will have the warranty extension. But also understand the warranty extension is from the In Service Date, but you will likely hit mileage before the time.

Given the mileage you currently have, you may be fine even if your engine is in the problem build window. From just doing searches for failures, it appears there were more failures in the later year vehicles. Seemed as we got into the 2023-2024 models many of the engines would fail before the first oil change.

 

[jfoj]

Price of oil change is insignificant. Change it. Better yet, take this opportunity to change it yourself and put in 0-40. Contrary to popular belief, there are no 0-40 police trying to void warranties.

These engines, good or bad are not going to fail due to 0W40, they are more likely to fail with 0W20.

And regardless of what viscosity oil you run, any engine will suffer from extended oil change intervals vs more frequent oil changes. The filter only captures larger dirt particles, the detergents in the oil keep dirt in suspension, the only way to remove any dirt/carbon/soot/fuel that the filter does not capture is to drain the oil.

Change your oil frequently, I would not recommend exceeding 50% on the OLM, rinse and repeat if you value your engine. What you spend in additional oil changes will not even touch a single internal engine repair or loss of value if you trade or sell because of an engine problem.

 

[Scarey]

Post your mileage before the switch if you are implying you didn’t lose 2mpg with the switch.

The correct challenge is to show the evidence there is a 2 mpg loss by switching to 0-40.

 

[Vladimir2306]

Not sure where anyone came up with a 2 MPG hit running 0W40 vs. 0W20.

This was just one trip with the 0W40 and there was a bit of stop and go driving in this average.

This is also with the Auto Stop/Start and DFM disabled!

View attachment 457829

I have already realized that you are the most important specialist here on the forum, and your opinion is the most important. My consumption on oil 0-40 has increased. Where I used to drive on oil 0-20 with a consumption of 14 liters per 100 km, according to the American it is 16.8 mpg, now I have 15.4 liters per 100 km, or 15.3 mpg on oil 0-40

 

[jfoj]

Put 0W20 back in your engine and see what happens.

But also understand, your vehicle just went thru a complete heart transplant so you have a few more variables than just a different oil viscosity.

Also realize that your engine assembly is basically new, it will loosen up over time and your fuel economy will increase.

 

[Scarey]

I have already realized that you are the most important specialist here on the forum, and your opinion is the most important. My consumption on oil 0-40 has increased. Where I used to drive on oil 0-20 with a consumption of 14 liters per 100 km, according to the American it is 16.8 mpg, now I have 15.4 liters per 100 km, or 15.3 mpg on oil 0-40

The only variable change is the oil?

 

[Vladimir2306]

Put 0W20 back in your engine and see what happens.

But also understand, your vehicle just went thru a complete heart transplant so you have a few more variables than just a different oil viscosity.

Also realize that your engine assembly is basically new, it will loosen up over time and your fuel economy will increase.

That's exactly what he said my engine was new. Why do you repeat my own words? Of course, I will fill 0-20. I have another 500 km to run-in, after which I will return again to 0-20 oil