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In the owners manual, the only oil for M5 is 20W50 (archive)
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Posted by Tim In PA on October 28, 2001 at 07:58:50:

In Reply to: Oil viscosity question posted by Miguel on October 26, 2001 at 23:35:26:

But I use 15W50 Mobil 1. Car runs like a champ.

Tim

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