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There are some owners on here that have over 80K and they haven't reported having carbon build up problems.
It's obviously happening, but I'm just concerned that some people will jump to conclusions and claim that all 135i's have "excessive" build up, when it may just be some do and most don't, and how one drives makes a difference.
One other factor to build up is oil changes. BMW has gone to some long intervals. That may be a contributing factor.
It would be interesting to see if those who change their oil half as soon as BMW calls for it, and they drive a good distance on daily driving, if they have lower numbers of problems with build up.
But, we may never get that data.
The other thing is, this seems to be related to DI engines, and nearly every engine is going with this, with some improvements for sure.
I wonder if the N55 engines have less of an issue due to their new design, and using valvetronic?
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