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oil leak

Engine

Model: 912E, Year:1976, Mileage:130000, Type of use:Street use only
My 1976 912E has developed a hefty oil leak that seems to be problematic on the passenger side, with a lot of oil on the floor and burned oil on the exhaust rolling from the passenger side rear wheel well after a ten or fifteen minute drive. I checked and replaced the valve cover gaskets and the oil return tube seal rings, to no avail. The only thing else I can think of that could be slinging oil near the back bumper is the real main seal/pulley seal. There appears to be no oil leaking where the engine meets the gearbox. If that is the case, will I need to drop the engine from the car to replace that seal or can the job be done with the engine in place?

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