Originally Posted By: TiredTrucker
Originally Posted By: FetchFar
Dexos1 is a tougher spec to meet than the standard SN/GF-5, particularly in wear, deposits, and foaming. Lubrizol ranks it quite high in wear performance, according to the fun tool at
Link to Lubrizol's Spider Chart.
I like the discussion on whether it "has to be" a synthetic or not. Notice GM just specified performance and let the oil companies do the rest, although, really, GM also looked at what could be done with a good syn blend currently.
What could be cool is the first oil company to come up with a conventional dino oil that meets dexos1.
Except in one area... dealing with ethanol. Since more and more locales are requiring oxygenated fuels containing ethanol, dexos fall flat on its face compared to SN/GF-5, and the situation the way it is with local and state mandates regarding ethanol, I would think that is just as important. So, I don't quite look at the dexos1 spec with any sense of fondness. Any oil that claims to meet all three specs will probably be a safe bet for all situations.
dexos1 Always exists as a spec to pass
on top of the basic SN/GF-5. In fact, for all dexos1 synthetics, they meet a bunch of other specs as well. Point is, an oil is never ONLY a dexos1.