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Old 12-28-2012, 06:23 PM
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timfitz63 timfitz63 is offline
MT = Doppler Shifting
Location: Lorena & San Antonio, TX
Join Date: Aug 2010
Posts: 931
Mein Auto: 2007 X3 (MT)
Originally Posted by Madwick View Post
is there any kind of additive that can be used aside from going to the dealership?
Not really. Some recommend using Seafoam, but I'm personally not convinced that will really help. The fundamental issue is that, unless the cleaning agent can be directly applied to the intake valves, it's not going to be effective. Ordinarily, the fuel itself would clean the intake valves; but since the fuel is injected directly into the cylinders on this engine, it never touches the intake valves, and they apparently cake up with re-circulated crankcase vapors. So any additive put into the fuel will also bypass the intake valves.

The best method of cleaning these intake valves appears to be through the use of some kind of abrasive: wire brush (with or without a cleaning agent) or the walnut-shell blasting employed by MINI dealers.

X3 w/6-speed & Sport Package:
A sports sedan disguised as an SUV...
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