Posted by Bruce(OR) on January 30, 2013 at 21:39:54 from (97.115.30.214):
In Reply to: TO 20 oil pressure posted by 37Chief on January 30, 2013 at 19:51:20:
When I did the wife's TP-20 the OP was around 35 after rebuild hot or cold. I also went down to the hyd shop and picked up two rubber oil pick up line seals for about $3 and replaced those along with rebuilding the oil pump. I also took the oil gauge down to an instrument repair shop and had it tested for accuracy. It was off by 2 PSI. The zinc oil additive is wonderful for flat tappet cams. Heavy duty rated oil leaves a film behind that energy conserving oil does not. Now if your oil pressure on a used motor is 15 at warm idle and 20 under speed, I would suspect it has a good amount of life left in it.
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