Oil leaks from the valve cover gaskets, timing cover gasket, distributor o-ring, and rear main seal area are common. The leak at the rear main seal area is generally not the seal itself but the bearing cap to the engine block seal. An oil leak could also be internal to the distributor, if oil is found inside the distributor then the distributor should be replaced.
Engine Oil Leaks on Dodge D250
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a 1991 D 250 2 wheel drive with a cummins engine to convert the 2 wheel to a 4 wheel drive.