We get it. You don’t like the DEXOS scheme.
You still haven’t provided any documentation to back up the claim that API SP=DEXOS
This topic has been covered to death. DEXOS is published and verifiable set performance benchmarks of API and ACEA testing that exceeds GF-6. That fact is immutable.
As it stands, GM went to great lengths to make sure it does not violate the brand, trade, or corporate name clause of 15 U.S.C.
We could argue the sinister ploy of tying the standard to sales royalties, and you’d get no argument from me. But in regards to a verifiable warranty standard on which the consumer warranty is based, GM would win this argument in court 100% of the time as it stands. So I go back to my original statement. Will it be detrimental to the OP’s engine? Not in the least. Could it cause a denial of warranty if non-DEXOS oil is deemed the root cause of failure? Absolutely.
You can’t compare Dexos and SP. Because SP is one series of tests. Dexos is a different series of tests. The main difference being the NOACK test.
Dexos Gen 2 was built off SN.
Dexos Gen 3 was built off SP.
You can’t have a Dexos approved oil without it meeting SP. But you can have a SP oil that is better than Dexos. You can also take a non dexos oil, put in an API approved additive, and it’s a non dexos oil.
You’re asking for exact formulation and testing data. Which is not public information.
SP/GF6 is a set of Minimum requirements. (In case of certain additives like ZDDP and such, maximum legally allowed.)
You can exceed SP greatly. Thus why you can have a synthetic blend 5w30 SP oil. That oil will never be Dexos approved.
You can also have a very very robust full synthetic that would exceed SP and Dexos, but will never be Dexos approved. So trying to say one is greater than the other is completely situational and completely formulation based.
GM would have to show that oil caused failure. Which being an SP oil, they couldn’t do unless the oil was formulated wrong. In which case, it would go to the oil manufacturer.
Also, I don’t particularly care about Dexos one way or another. I think it’s dumb, but GM makes tens of millions of it. I’m a capitalist. Good for them. People fall for marketing.