This is the bespoke oil for the new C8 Corvette Z06, Mobil 1 5w50 Supercar, rated API SP and DexosR. Clearly this Corvette needs a hefty additive package. How to describe this oil in once sentence or less, here for a good time, not a long time.
I suppose that we should mention although the add packs are a bit strange it makes up for it in viscosity. Will you be showing a UOA after a few thousand miles. Wondering how much viscosity loss would happen. Thanks for sharing.
That's great! have fun & stay safe.I have a track weekend at Circuit of the America's in two weeks, which will result in about 4hrs of track time over 2 days. I'll probably send it off after that and see how it held up. If 760hp and near 8000rpm can't get it to sheer, its not gonna sheer.
From what i read in some mobil patents, its to maximize the performance of the anti wear package. The lower they went with detergents, the thicker antiwear tribofilm was formed on metal parts. But they acknowledged that to low and they had cleanliness issues.I wonder why such low detergent levels.
For one thing a simple $30 spectrographic analysis isn't a definitive determination of "detergent" levels and future cleanliness of the engine. Plus detergents in oil don't clean.From what i read in some mobil patents, its to maximize the performance of the anti wear package. The lower they went with detergents, the thicker antiwear tribofilm was formed on metal parts. But they acknowledged that to low and they had cleanliness issues.
No but the PDS for this oil has magnesium and calcium pretty dam close to what this 30 dollar spectrographic analysis shows. I never stated that this analysis said anything about the future cleanliness of an engine. Im simply stating what i read in an exxonmobil research and engineering patent for a gf-6 lubricant composition exhibiting excellent antiwear properties. Nothing more.For one thing a simple $30 spectrographic analysis isn't a definitive determination of "detergent" levels and future cleanliness of the engine. Plus detergents in oil don't clean.
They don’t use a GPF and that level of ZDDP is fine for cats if you don’t burn it.Travis is on the money, the lower the detergent levels the better the anti-wear. The engine this oil was designed for has shown to be brutal on oil, with a lot of potential wear issues due to intended use and overall design. I honestly would describe this oil as a nerfed race oil, and not a beefed up street oil.
While every other manufacturer is reducing ZDDP in the oil to prevent cat fouling, GM almost doubled the amount of ZDDP in this oil spec, despite this engine being in a street car with full emissions. Clearly they were mitigating a potential issue more important than the catalytic converter.
At least that is my theory. I'm not sure what else would explain an API SP, manufacturer specified oil, with 1200ppm of Zinc LOL
They don’t use a GPF and that level of ZDDP is fine for cats if you don’t burn it.
I can find no evidence that the LT6 burns significant amounts of oil. It does have a common leak, though. I'm sure this engine is hard on oil but Porsche does similar density and revs with the GT3 engine and more power with the GT2 RS and they are using ~900 ppm M1 X3 in Cup cars even. I'm sure GM knows what they are doing with this oil though. I expect these to attain high mileage honestly, every prior Z06 has had owners rack up the miles.The LT6 engine in the z8 Z06 devours oil
That sounds a lot more like a bug than a feature. What benefit is there to either one of those in terms of design?The LT6 engine in the z8 Z06 devours oil, and fuel dilutes the hell out of it. GM knew that, and specced 1200ppm zinc anyways, because they needed the anti-wear. 5.5 liters, 8600rpm, near 700hp, that thing is a beast. I doubt any of those cars will ever see high enough mileage to kill a cat converter from Zinc.
None, and they were definitely not intended, but probably anticipated.That sounds a lot more like a bug than a feature. What benefit is there to either one of those in terms of design?
I should also say that the XOM patent i read all this info on also mentions the lube composition exhibiting superior tribofilm formation on DLC engine parts. The lt6 uses DLC cam followers IIRC.Travis is on the money, the lower the detergent levels the better the anti-wear. The engine this oil was designed for has shown to be brutal on oil, with a lot of potential wear issues due to intended use and overall design. I honestly would describe this oil as a nerfed race oil, and not a beefed up street oil.
While every other manufacturer is reducing ZDDP in the oil to prevent cat fouling, GM almost doubled the amount of ZDDP in this oil spec, despite this engine being in a street car with full emissions. Clearly they were mitigating a potential issue more important than the catalytic converter.
At least that is my theory. I'm not sure what else would explain an API SP, manufacturer specified oil, with 1200ppm of Zinc LOL
I am surprised they have so much ZDDP with DLC used. I assume they have done their homework though.I should also say that the XOM patent i read all this info on also mentions the lube composition exhibiting superior tribofilm formation on DLC engine parts. The lt6 uses DLC cam followers IIRC.
Based on the MSDS it also uses the same base oil antioxidant as all the triple action formula mobil 1 oils.
Thank you for sharing that! I did not know any of that! Interesting stuffI am surprised they have so much ZDDP with DLC used. I assume they have done their homework though.
I have doubts the Supercar 5W-50 is exactly an you describe because the detergent levels are very different. Also, the Z06 isn’t turbocharged and so they wouldn’t be adding boron just for a turbocharged application.In my discussions with folks in the know the Dexos R 5W50 was based on Mobil 1 FSX2 5W50, with more ZDDP added for wear protection, and more Boron added for turbo charged applications
Is there anyway Dexos R isn't better than FSX2, besides early cat issue, which in reality don't happen in supercars since they aren't daily?
Likely my next oil.