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      01-10-2013, 11:28 PM   #35
135i_vs_
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Drives: M5, 135i, 335d, F10 550xi
Join Date: Sep 2011
Location: CT

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Now that you are a 335d owner, maybe you will write a long letter to Roundel? :-)

I am doing my own research on carbon build up and Diesel engines; based on Ford diesels, it is bad for the engine to have an average speed below 35mph (total miles / total engine run time). It causes serious carbon build up. They even have the total engine runtime counter on their dashboards. Interesting...