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Mainly because I don’t want anything less than a 40W oil in my car and the 0w40 shears down into the 30w category pretty quickly. And I track my car and it spends a lot of time between 3000-6000 rpm
Thanks for working on that and for you patience. I want to be clear - I'm not arguing either way - I'm trying to find out what its made from.
I have looked at both the PDS and the SDS for Mobil 1 Supercar 0W-40, and the problem I am having is that neither one says it is a Group III (hydrotreated heavy paraffinic) base oil. I posted the SDS in post 14, but I found a different version....they are similar. https://content.speedwaymotors.com/D...SDS_2023_1.pdf This is what it says:
It contains between 5-10% 1-DECENE, TETRAMER AND TRIMER HYDROGENATED. Using the CAS number and the name you can look this up in the "chemical book" here https://www.chemicalbook.com/Chemica..._CB6170754.htm
and see that it is in fact a Poly alpha olefin (PAO). So, while its not 100% PAO, it is between 5-10% PAO based on that alone.
The other major ingredient is DISTILLATES, HEAVY, C18-50 - BRANCHED, CYCLIC AND LINEAR, 60-70%. The process for producing is the Fischer-Tropsch Process. It is a " complex combination of hydrocarbons obtained from a feedstock derived from the catalytic hydrogenation of carbon monoxide " . Its a Gas-to-Liquid process.
There are multiple sources - all describe it the same way.
Here is a little article that seems to explain the difference dated March 2026. Its not specifically about Supercar but is about Mobil products and mentions the Fischer-Tropsch that is used in production of the Supercar oil per the SDS that I referenced. https://cartipsdaily.com/castrol-vs-mobil-1
So, I would say based on the SDS, that Mobil 1 Supercar 0W-40 is a blend of Gas-to-Liquid (GTL) and PAO base stocks. Its not Group III hydrocracked.
Andy since that suit was lost by Mobil saying a "more highly refined" conventional "Dino Oil" can be called Synthetic of Fully Synthetic as those were deemed JUST Marketing Words decided to get an SDS from Castrol (who started this whole confusion.) See Below:
The SDS says it's ~90% Hydrotreated heavy paraffinic.Mobil says Supercar Oil is mostly Group III hydrotreated heavy paraffinic Bottom Line Castrol Full Synthetic AND Mobil Supercar oil are both mostly "more highly refined" plain old "dino oil!"This is what Google AI quotes API as defining when I asked what Hydrotreated Heavy Paraffinic means:
Base oil type: Group III hydrotreated heavy paraffinic refers to a highly refined mineral base oil made from crude oil. It undergoes a severe cracking process that restructures the molecules to deliver a high-purity, synthetic-like fluid commonly sold as a "full synthetic" motor oil.
Group III: Refers to the API classification for base stocks that contain ≥ 90% saturates, ≤ 0.03% sulfur, and have a Viscosity Index (VI) of 120 or greater. Group III oils offer excellent thermal stability and resist breaking down in extreme temperatures.
Hydrotreated: The oil has been treated with hydrogen at high temperatures and pressures in the presence of a catalyst. This process removes impurities (like sulfur and nitrogen) and converts unstable molecules into highly stable, saturated ones.
Heavy paraffinic: Refers to the physical structure of the oil. It is derived from paraffinic crude oil and features long, waxy hydrocarbon chains that give the oil a higher (heavier) viscosity, making it ideal for engine oils and heavy-duty industrial
