Considering API is short for American Petroleum Institute, it’s not surprising. If you’re not going to use ILSAC standards (which aren’t very breathtaking IMO), there are a few ACEA standards and Euro manufacturer specifications which do a little more to make sure you’re getting a good oil.Thanks. What do you make of the fact that for the rest of the world, the manual doesn't even specify an API designation?
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ACEA A3/B4 is a good one, and the Porsche A40 is also. But those are minimum 3.5 HTHS, so Xw40s. There have also been some more knowledgeable folk here that say ACEA C3 in 5w30 when combined with VW 502/505(IIRC) is a nearly universal oil for American gasoline engines now that we’re on ULSG.