Hi Wayne,
I have a Porsche Boxster S 2010 3.4-2 Ive owned for only two years, low millage 28k, runs beautifully, great millage 9.8 L/100km fantastic performance the one thing that I'm not happy about is the black oil every oil, filter change at 3000k. I use Mobile 1 0w-40w The Porsche dealer has no issues with my black oil. I would like to see clean oil. Can you please advise
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