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Older manuals for S63 motors specified 0W30, 5W30, 0W40, 5W40. Any are fine. You get the best fuel economy with the thinnest oil. BMW could not care less what happens to you motor out of warranty. Sometimes it seems like they could care less what happens while it is under warranty.
If you are a sheep, follow the manual precisely. Your transmission fluid is lifetime — please don’t change it even if ZF says you should…. Don’t change your coolant, either.
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