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      05-04-2009, 09:17 PM   #3
Finnegan
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Drives: Sapphire Black/Black Z4Mc
Join Date: Oct 2008
Location: At the track..or wishing I were at the track

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I recall reading over on the e90 site that some 335i owners (335 is DI) have reported the same thing. There was some talk about methanol injection as a way to both cool the intake charge and "wash" the valves and [hopefully] prevent carbon buildup.