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      09-29-2012, 06:38 AM   #5
R3N
Second Lieutenant
Australia
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Drives: None
Join Date: Aug 2012
Location: Perth, Australia

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I've used Subaru Upper Cylinder cleaner with good results on a car that had oil buildup in the combustion chamber from the supercharger leaking. Make sure to follow instructions. Can easily get them at any Subaru dealer