Disclaimer: I don't work on BMWs often these days. When I do, they're either really old or belong to fanatics who bring their own oil to me.

But when I *did*, two yrs ago, we found that the BMW oil from the dealer was the most expedient, cost effective way to get the right spec. I recall that there was only one grade of Mobil 1 which met the spec, and it was not stocked by any of our vendors. It cost only 5c a quart more to order BMW oil from the dealer, than to drive over to the distributors' and get the Mobil 1. So really, BMW oil was cheaper. It may well be the best solution- but again, that's just how I remember it- jugs of BMW oil were stocked on our shelves next to the VW TXT stuff for late TDIs and Rotella for old MB diesels.

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1985 300TD
1984 380SL
1983 280SE (full Euro, trunk triangle and all!)

Formerly owned:
1986 420SEL
1984 300D
1983 300D
1981 300SD
1976 300D