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Old 04-20-2013, 07:13 PM   #15 (permalink)
some_other_dave
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The current-generation MINI Cooper S models have a well-known problem with carbon deposits in the intake ports and on the intake valves. Walnut shell blasting is used to remove the deposits when they get bad enough.

Fuel dilution, however, has not been a problem that I have heard of.

Fitting an oil catch can and re-routing the PCV system to it has been used as a way to avoid the problem. I don't know if it is a complete solution, though.

-soD
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