GM 0w-40, Super Tech 0w-40, M1FS 0w-40, and Supercar.

[ylk1]

I wouldn't go that far claiming dexosR is a cash grab.
Companies tend to iterate on stuff they know.

dexosR iterates over dexos1gen3 incorporating some tests from ACEA.
LSPI tests done on GM engine.

We still don't know SAPS and other formulation limits for dexosR

https://bobistheoilguy.com/forums/threads/gm-dexosr-dexosd-specifications.381726/

 

[burbguy82]

I was more referring to KV100.
0W30 you are using is probably AFE? Or some other ILSAC oil. At the same time you have 0W30 like Castrol Edge that I use currently in BMW and Toyota and that is HTHS 3.5 or higher oil.
But in really cold areas, very short tripping, thin oils like 0W20 are beneficial as engines don’t sometimes reach operating temperature at all. You actually want thin stuff there as it flows better at KV40.

I think it was M1 AFE yes.

 

[haggler]

I wouldn't go that far claiming dexosR is a cash grab.
Companies tend to iterate on stuff they know.

dexosR iterates over dexos1gen3 incorporating some tests from ACEA.
LSPI tests done on GM engine.

We still don't know SAPS and other formulation limits for dexosR

https://bobistheoilguy.com/forums/threads/gm-dexosr-dexosd-specifications.381726/

Its a cash grab in the sense that they only had one licensed oil (Supercar) that that Mobil1 (who they're in bed with) charged boutique prices for. The Corvette/Camaro V8 oil tax. Not to say its bad stuff.
That is until these L87's started going boom now all of a sudden the rest of the 0w-40 line at mobil 1 is "certified" so they don't have to absorb the price of Supercar across the recall. At least when Dexos2 was the standard, there were multiple suppliers and it at least appeared transparent.
It still is only Mobil1 products, but now I can go out and buy M1 FS 0w40 for $20/5qt after rebate, "retain" my warranty, and call it a day.

 

[ylk1]

Its a cash grab in the sense that they only had one licensed oil (Supercar) that that Mobil1 (who they're in bed with) charged boutique prices for. The Corvette/Camaro V8 oil tax. Not to say its bad stuff.
That is until these L87's started going boom now all of a sudden the rest of the 0w-40 line at mobil 1 is "certified" so they don't have to absorb the price of Supercar across the recall. At least when Dexos2 was the standard, there were multiple suppliers and it at least appeared transparent.
It still is only Mobil1 products, but now I can go out and buy M1 FS 0w40 for $20/5qt after rebate, "retain" my warranty, and call it a day.

Can't argue with that. Agree that there should've been more choices. should've tested other lines of oils for DexosR earlier.

 

[burbguy82]

Is skepticism one of the ingredients in the new 0W-40 approval package?

sure.

It either does meet or does not meet. one of the three is correct:

FS met, but was not advertised as such
FS and SC are the same thing different bottles
FS really does not meet the spec

I can see a bunch of class actions over this one, and perhaps spawning ones over the 5.3 afm thing.

 

[OVERKILL]

sure.

It either does meet or does not meet. one of the three is correct:

FS met, but was not advertised as such
FS and SC are the same thing different bottles
FS really does not meet the spec

I can see a bunch of class actions over this one, and perhaps spawning ones over the 5.3 afm thing.

I'd assume your first one. I highly doubt DexosR is more stringent than A40, LL-01, 229.5...etc.

 

[perkz]

Basically they threw SA out the window, and they probably fast tracked all 0w40's to keep confusion down being there are now several. Make it customer foolproof so anyone that walks into a AZ and grabs the ESP 0w40 by mistake at least has the dexos R approval.

While viscosity may help, this to me is more of a manufacturing defect of some sort where a heavier viscosity may help. I'm skeptical it will.

Well, they have already walked back the 0W40 idea in the version 3 of the tech bulletin. That said, based on the damage vids, 0w40 would probably buy them a few months on some of those engines. Right now, a GM dealer can't sell any of those vehicles and would likely not take them on trade. So you have a vehicle you can't sell and maybe unsafe to drive, but you are still having to make the car payment. Bad deal right now.

 

[perkz]

Some speculation about the crank dimensions at this time …

The vids I saw weren't even wear across the bearing, like from low vis oil. They were sharp lines that indicate debris in engine.

 

[burbguy82]

I'd assume your first one. I highly doubt DexosR is more stringent than A40, LL-01, 229.5...etc.

I agree that it is most likely it already met the spec. IMO, for money. As much as I dislike those who tout Zee German's engineering prowess as being uber-good.....a 700 hp MB engine, lubed by FS is protected....therefore a 500hp GM engine, would also be protected.

 

[sw91]

Is that really a good idea to run a diesel oil in a C8? I think I would stick with M1 Supercar. I´m not sure I sould want a diesel additive package swirling around in such a high performance engine. I wouldn´t touch it for my C6, for sure, until I heard someone in the know, such as a Valvoline engineer, really explain why it would be good.

Before they renamed it to Dexos R Supercar, Corvettes required Dexos 2 0w40. So technically, it was a diesel oil.

 

[burbguy82]

The vids I saw weren't even wear across the bearing, like from low vis oil. They were sharp lines that indicate debris in engine.

so i wonder why the thicker oil then?

 

[pzev]

It was my understanding M1 ESP 0w40 and M1 Supercar 0w40 were the same oil. M1 FS 0w40 was always a different oil.

sure.

It either does meet or does not meet. one of the three is correct:

FS met, but was not advertised as such
FS and SC are the same thing different bottles
FS really does not meet the spec

I can see a bunch of class actions over this one, and perhaps spawning ones over the 5.3 afm thing.

It is strange, but all of Mobil 1's 0w40's are unique and bespoke oils, none of them are rebranded in different bottles, at least according to the product data sheets and UOA's I've seen. The ESP X4, FS, Supercar, and C40 GT all have different specs and additive levels per M1's documentation.

At least in 5w50 M1 only has two varieties lol, the Supercar and FS.

 

[buster]

dexos R looks to be a good spec - WPD avg is set to 5.4 min. A rating of 5.5 for piston deposits after 100 hours of testing is commonly considered outstanding.

For comparison sake back in 2014 Amsoil scored a 7.7 WPD avg per SEQ IIIG (now IIIH).

We know that Mobil 1 Supercar greatly exceeds the spec per XOM article.

"We were trying to put together an oil that would just crush all of those tests and well exceed the limits for those, "Salvesen says

 

[perkz]

so i wonder why the thicker oil then?

I will guess that they are anticipating failures from poor surfacing on the crank, that will also be a problem, but not in the vids I have seen to date. Higher viscosity oil would increase the distance from the bearing surface to the crank surface. The argument for lower viscosity oil was based on reduced tolerances based on better crank surfacing, and better oil.

 

[Southpaw338rum]

I watched a video a couple of days ago where the creator was contacted by a source that works for GM and disclosed that the affected engines had crankshafts made at a plant in Mexico and were found to be out of spec and or had debris in oil passages. Right now engine failures are running at 3-4%. I own a 23 GMC Yukon Denali that only has 15k on the clock. When most of this info surfaced it was due for an oil change and I grabbed what I had on the shelf that wasn't 0W-20 and that was 15W-40 and in it went right before my wife went on a 1000 mile road trip. Lake Speed did a video on YT about why using a diesel oil in a direct injected gas engine is a bad idea and it has to do with the additive package causing pre-ignition. I will dump the 15W/40 soon and try a Euro formula Castrol Edge 5W/40 until GM comes up with a fix. I have a friend who is a service manager at a Chevy/GMC dealer and they are still in the dark as to what will be required. Owner recall letters are supposed to be coming around June 9th, we will see. In the mean time I have seen a couple of GM techs post up using a special GM tool to measure engine harmonics and if the engine fails the test the customer will receive a new engine and if it passes the test it will receive an oil change and new fill cap with 0W40 on it. I watched one engine tear down from a warranty replacement engine and some of the rod bearings were cooked pretty badly turning the big journal of the rod black from high heat! I would be curious to know what the oil temps in these engines are running at because that might tell a story if it is abnormally high. Another factor I believe could contribute to all of this is extended oil change intervals based on the oil life monitor system. I rarely ever go the distance recommended by the oil life monitor, I always change much sooner.

 

[Jmoney7269]

I don’t think ST has anything to do with the 6.2 issue. That motor came with P66 0W20. (Same as my Tahoe). That ST is not even an SP is it?
The diesel oil is not related to anything - GM puts Delvac in DMax.

I do think they fast tracked the Dexos R approvals - but were likely on the fence already with SuperCar hard to find …

Wouldnt a euro oil work just fine? Something like edge synthetic a3/b4 with a Porsche a40 rating?

 

[4WD]

Wouldnt a euro oil work just fine? Something like edge synthetic a3/b4 with a Porsche a40 rating?

Yes, but they were in a hurry to approve lubes and seems Mobil was the fastest in house way to do it …

 

[We're Metals]

Wouldnt a euro oil work just fine? Something like edge synthetic a3/b4 with a Porsche a40 rating?

Just as well as Supercar 0w-40