BREAKING: GM is officially recalling the L87

[Marky Dissod]

Someone here posted this 2MpG non-sense, they just pulled that number out of their backside.

My @$$ is a pessimist, as is the rest of me. Unlike some people I'm HAPPY to be wrong.
If I had said the MpG penalty was barely detectable and anyone had detected, I'd be a much worse person for being wrong in that case.
When you put your hand in my @$$ next time, say thank you.

 

[Vladimir2306]

The only variable change is the oil?

Well, and a new engine) and so yes, everything is the same, and the route and the time of year, and the road from home to work. So far, I'm watching. Maybe, of course, it will still decrease after running-in. And also on oil 0-40 the oil pressure has increased a lot

 

[jfoj]

Well, and a new engine) and so yes, everything is the same, and the route and the time of year, and the road from home to work. So far, I'm watching. Maybe, of course, it will still decrease after running-in. And also on oil 0-40 the oil pressure has increased a lot

You say the oil pressure increased a lot, can you provide some value or a point of reference. I understand this version has no numeric display, but just the bar graph.

I believe my oil pressure maybe increased 5-8 PSI, not sure I have a firm value because I changed the to 0W40 early on.

Looking at your dash picture and where the bar graph is relative the handle on the oil container, this is about where my oil pressure is and it was not much lower as I recall with the 0W40.

But at you mentioned, there is what we can agree to call "Run In" not really break in, but everything will loosen up in 1000-2000 miles and you need to drain the oil to get some of the wear metals that are not captured by the oil filter out of the engine.

 

[jfoj]

My @$$ is a pessimist, as is the rest of me. Unlike some people I'm HAPPY to be wrong.
If I had said the MpG penalty was barely detectable and anyone had detected, I'd be a much worse person for being wrong in that case.
When you put your hand in my @$$ next time, say thank you.

@Marky Dissod

Understand that posting something like what you stated without much info to back it up really causes people to be concerned. There is no way there will be a 2 MPG hit with changing from 0W20 to 0W40 oil.

I get being pessimist, but at least be somewhat realistic.

And do you even have a 2021+ 6.2l light truck that you have any experience with?

 

[Vladimir2306]

You say the oil pressure increased a lot, can you provide some value or a point of reference. I understand this version has no numeric display, but just the bar graph.

I believe my oil pressure maybe increased 5-8 PSI, not sure I have a firm value because I changed the to 0W40 early on.

Looking at your dash picture and where the bar graph is relative the handle on the oil container, this is about where my oil pressure is and it was not much lower as I recall with the 0W40.

But at you mentioned, there is what we can agree to call "Run In" not really break in, but everything will loosen up in 1000-2000 miles and you need to drain the oil to get some of the wear metals that are not captured by the oil filter out of the engine.

We have a metric system of change, if the scale is 800 kpa, the middle of the scale is 400 kpa. Now the oil pressure on oil 0-40 is about 350 kPa, and on oil 0-20 it was about 150-200 kPa. So I think the oil pressure has doubled, just a multiple of the doubling of thick oil. I will change the oil not after 1000-2000 miles, but after 750 miles after installing the engine. Or rather, they assembled the engine for me, drove about 50 miles on it, changed the oil, now another 700 miles, then changed the oil. And already the oil is 0-20 and the change according to the regulations once every 7500 miles

 

[Marky Dissod]

@Marky Dissod
Understand that posting something like what you stated without much info to back it up really causes people to be concerned.
There is no way there will be a 2MpG hit with changing from 0W20 to 0W40 oil.
I get being pessimist, but at least be somewhat realistic.
And do you even have a 2021+ 6.2L light truck that you have any experience with?

If I'd've been an optimist in this case, it'd've been worse to be wrong.
No, I do not OWN a 2021 6.2L, although I've driven some; they're part of the motor pool, more are 5.3L of course.
What I have done is changed my '02 Tahoe's motor oil from 5W40 (previous owner) to 0W20, after which I noticed a gain of 2MpG.
However, changing from 0W20 to 5W30 increased my warmed-up oil pressure enough to make me feel more comfortable, so I stick with 5W30.

 

[DuraYuk]

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!

View attachment 457837

Lmao. Dude if we wanted fabricated results I could show you a crazy mpg screenshot of my diesel going downhill. But that would be disingenuous.

Is this running 9 quarts too? With the new valve body? Hard to keep up with this giant thread.

 

[DuraYuk]

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

Lmao dude you hit the nail on the head.

I cant wait until he starts selling something. Im guessing either a afm/dfm disabler, or a Auto start/stop disabler, or valve bodies. Or maybe that extra quart of oil he keeps pushing on people.

Wouldn't be the first time.....

 

[jfoj]

@DuraYuk,

You obviously did not listen to your mother.

I did not fabricate results, I showed results of a very ideal situation where I even claimed I was Hypermiling. Nothing wrong there. As I mentioned "24 MPG, gotta love this, but the moment I need to climb a grade, this story is over!".

 

[DuraYuk]

@DuraYuk,

You obviously did not listen to your mother.

I did not fabricate results, I showed results of a very ideal situation where I even claimed I was Hypermiling. Nothing wrong there. As I mentioned "24 MPG, gotta love this, but the moment I need to climb a grade, this story is over!".

Yeah I know what you said. Im saying if I did that I could show double that with a diesel.