For what it's worth, I've always put Mobil 1 5W30 into my 530D's and anytime I've been under the rocker cover (not that often mind) and over 300K miles across 3 different M57's - they are like new - I tend to stick with Mobil 1 as I've never had to shell out for a blower either. So I'd agree with what Valdeis stated earlier - If I had a M3 I'd be opting for Mobil1 in the factory advised grade.
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