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1990 944 S2 Oil pump failure

Engine

Vehicle Information: Model(924/944/968): 944; Year: 1990; Body Type: Cabriolet; Total Mileage: 100,000;

Recently, my oil pressure dropped immediately after exited the freeway at speed. When I'd accelerate, the pressure would return, but when restarting the car, I have no pressure. Obviously, I haven't driven it since because I want to avoid damaging the engine. The mechanic claims the oil pump failed, but other shops have informed me that this is extremely rare and that it is more likely a loose crankshaft bolt. The car has only 100k mi. How unusual is this? Is there anything else going on here?

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