Quote:
Originally Posted by DSTR
M235i - 2014 89000km's. No issues with the carbonization of the intake valves. My mechanic is not seeing a major issue at all with any M engines with respect to this issue. Certainly not with N55 powered M2 I have or this M235i that I have and do love. The cam area was as clean as the intake valves. NO cleaning was warranted. BMW did a good job with valve timing and EGR per my dealer mechanic.
The attachment is from a recent valve box/cover replacement. At this time the intake valves were observed/analyzed. Very pleased!
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Well it is nice that your upper end was clean but the upper valve train build up is not the same as intake. I can only assume you drive longer intervals or more frequent oil changes.