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Reviving an old thread, but are you still running this oil Spinny02?
I took my M5 for a service today to a well regarded BMW specialist independent workshop and they are big advocates for the Motul 5w40 in these engines. I didn't have any particular concerns with the BMW LL oil that was in the car (my car doesn't burn oil) but was happy to go with their recommendation given that Motul has a good name amongst enthusiasts.
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