GSR M52TU / M54 Four-Bolt Oil Pump ShaftThe GSR M52TU M54 Four Bolt Oil Pump Shaft is the ultimate piece of engine insurance for your non M E46, Z3 Z4 or any other M52TU M54 powered BMW. Whether your car is a race car, dual duty street track car, or you simply enjoy spirited high performance driving, your stock oil pump shaft is at risk for failure. The factory oil pump nut can back off, and the shaft has a known history of breaking at high RPM. Either of of these failures would quickly
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