I have read of cars which have zero oil leaks when using a standard oil. When they switch to a full synthetic the cars develop a leak. Especially on older seals and gaskets.
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2011 Cayman Speed Yellow
1988 924S (Sold) 2000 Boxster S (Sold)
2006 Cayman S (Sold) 1990 964 C2 (Sold)
1978 911 SC (Sold)
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