Sorry, I read C220, not W220. Not sure about the spec change. I DID hear in a recent thread that M1 was changing its base stock from group 4 to group 3 (is that the proper terminology? anyone?) Interesting. Where are the oil gurus?
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former: 83 300D, 97 C230, 93 400E
current: 08 C300 Luxury , 92 500SL
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