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The local MB dealers in Southeastern PA used Quaker State 15W40 mineral oil for that vintage engine. That was before MBUSA switched and used Mobil 1 as the factory fill around 2000. Mobil 1 0W40 is the factory fill for all new MB vehicles now. FWIW I use Mobil 1 15W50 in our 1991, 1992 and 1998 Mercedes year round.
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Fred Hoelzle
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