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What I am wondering about is if BMW did anything to equalize the cylinder temps across all cylinders. When I was running the 335i, I read an BMW engineer's comment saying that cylinder #6 (the one under the firewall/bridge) was routinely seeing higher temps than the others. Presumably by virtue of its positioning and the lack of airflow in the area.

If that is true - and I have no way of telling with certainty - that could be a major contributor to reduced longevity. It also could mean that in many situations the computer is twiddling with the timing to reduce power and temps to that cylinder.


I'm not suggesting the N54 is a time bomb, just throwing some comments out there for people to sink their teeth in...

(And biding my time until the M is returned to me, after I experimented with winter grip by jumping a curb on my way home.)