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1981 911SC Oil leak

Engine

Vehicle Information: Model: 911 SC; Year: 1981; Body Type: Coupe; Total Mileage: 110,000;

Small but persistant oil leak between engine case and oil cooler. Recently removed engine and inspected cooler removed from engine (no evidence of leak in cooler). Replaced two "O" rings, and replaced cooler and engine. Leak contiues but only while engine is running, i.e. no improvement.Porsche mechanic tells me that some of these engines developed cracks from the vertical oil gantry located just inside the case where the oil cooler is in contact with the engine case.Question; 1) is this a likely possibility with my engine? and, 2) can it be fixed and how? Thanks for your attention.

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