have made the following observations lately on the vehicle in question. These pressures and observations are made before and after an oil change, and are the same:
cold idle pressure: approx 70PSI cold cruise pressure: approx same warm idle pressure: 15-20PSI warm cruise pressure: approx 40-50PSI. this is true if the throttle is pressed at all off of idle
Also-- if I nail the throttle while cruising, the oil pressure fluctuates between about 35-60PSIm, rapidly, and then stabilizes.
Oil is Castrol Syntec 10W30. I live in Charleston SC . Should I change to a different weight?
Given that pressure comes up when revs do, I don't think I have a problem here-- but want to ask people who kow more than I do. For comparison, my 1990 Jeep Cherokee with the 4.0 straight six with over
2000,000 miles on it, using same oil, has rock-solid 40+PSI indicated at hot idle, and 60-70 at cold idle.After this concern is addressed, I'm going to a bypass filter for my transmmission and oil filtration. See it here: