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A leak happens
rear main seal
Could be the fron seal, rear seal, or pan gasket
You will have to replace the rear main seal. This will require that the transmission be removed.
Bad window seal?
try castrol oil stabilizer - it will stabilize the oil and reduce the leak.
buick roadmaster 1992 rear axle does it have limited slip diff
Overheating can damage any seal.
Rear main seal.
Water can not leak from the rear main seal, only oil. Most likely there is a leaking freeze plug near the rear main seal dripping water onto it.
Look your diff seal...and check the oil in the diff...
remove engine or transmission to get to rear oil seal . you have to remove fly wheel to r/r rear seal .pretty heavy dutyjob.