Oh boy, an oil thread!
I like to use Castrol TWS 10 w 50. This NOT the same stuff you can buy at your local Pep Boys. The only place I know to buy it is at BMW car dealers. It is the only oil approved for the M3 that had the main bearing problem they fixed a few years ago.
As I understand, it has a high boron content which is supposed to be a good extreme pressure lubricant without the harmful effects of high ZDDP on the catalyst. So, I figure it should help the IMS bearing if / when oil gets in there.
As always, your results may vary...
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Kippis

986S
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Van Diemen RF97
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