All those numbers get confusing. I would put a master gauge on it. Your dash gauge may not be accurate. If it goes up beyond 60-70 pounds I think you should go in & check the pressure relief valve & see if is stuck. Otherwise I would go to a lighter weight oil. I like to use as thin as possible as long as the engine sounds good & doesn,t smoke or burn oil. It seems like those old Gimys always did carry a lot of oil pressure.
