Good advice below. I will add that the engine bearings in old tractors do not depend at all on pressure, they depend on oil being in the journal. Oil pressure loss as a cumulative issue is wear on bearing inserts or babbit poured bearings and journals that reduce the pressure because it can leak out sideways easier. Another reason is wear on the oil pump end plates or bushings that pump less pressure due to bypassing. Failure of the engine can come from excessive clearance allowing hammering of components, or a plugged passage starving a journal of any oil. if the truck is a parade/show unit, use 20/50 oil in it and grin all the way home. If it is loaded and used, and you are flush enough to make it happen pulling it down and going through the lower end is the way to go. Jim
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