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Old 11-29-2012, 05:36 PM
TRS550 TRS550 is offline
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Location: Ohio
Join Date: Jan 2010
Posts: 1,353
Mein Auto: 2007 550i
Valve guide seals prevent motor oil from the top end (valvle train, VANOS cams etc...) from seeping down past the valve guides and valve stems into the combustion chamber where it will burn.
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