Quote:
Originally Posted by Tony007
I had my dealer special order the Shell M 0w40 and I tried this in my M4 at the 1200 mi service. I drained that stuff out in 100 miles. The car subjectively felt like crap. The engine had no sensation of wanting to pull on the top end. As soon as I refilled with the Shell 5w30 the motor was instantly back to life.
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What am I reading here? A BMW approved oil made your car slow? Riiiiight...