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Why don't you do some of this work yourself? Anybody can unscrew an oil filter, cut it open and look at the contents. If the result are inconclusive, send the used oil in for analysis. There are lot of us here who can help you.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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