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Winter Storage Oil Leak

Engine

Vehicle Information: Model: 911 ; Year: 1988; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 59,000;

My 911 has begun leaking several ounces of oil from the engine during winter storage. It appears the leak is coming from the crankcase seam, although it's hard to tell. The engine doesn't leak at all during the spring/summer/fall season. I use Mobil 1 15w-50, which I change just before winter storage.A friend with an '84 911 has the same problem, suggesting this may have a known cause and remedy. Thanks for your attention.

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