that's funny, bmw uses the same 15,000 service intervals for us....except in miles.
actually i'm glad to find that out. now i don't feel like my 7500 mile oil changes are a waste. not that i really did before, but now i have numbers!
but to answer your question, the 4 non-BMW oils are in varying viscosities. iirc, the castrol is 0-30, the mobil is 0-40....i forget the others, but found the list pretty easily on the bmw website
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88 M3: BMWCCA J Sport
08 135: because streetcar
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