have had my PA deluxe for 35 years rebuilt everything just did the motor it had new bearings poured in the 70s-----I am running 10w30 at startup cold I can produce as much as 60 LBS oil pressure have adjusted PRV at 45 when the motor is HOT pressure is under 30 going down the road tried another gage----- I know I can use thicker oil the pump was rebuild with new gears by Tom Hanaford suggestions wanted-------------bobnroman@yahoo.com