Was just discussing oil changes, etc. with one of our local Porsche shop (not dealer) mechanics, who I find very trustworthy. He noted that he finds it common to check Boxsters at the 7,500-10,000 mark and see very dirty oil/filters. I know that oil is expensive and the book says 15,000, but I plan to keep an close eye on the dipstick. There is no better medicine to keep an engine healthy than good oil. I stay with Mobil synthetic as Porshe recommends.
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