Thanks for posting, Vin. Hadn't seen this story.

I have never used M1, but have used a lot of Castrol. I am with MD and others; I think any of the name brand synthetics are so far and away better than what most of used for the past 30 years or so, that any of them will do.

Having said that, not meeting a basic API test is a pretty big deal. Interesting to see how it turns out.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue