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51woodie · 06-17-2021, 09:24 AM

I was running Rotella 15-40 in my stock 59AB, and was getting 20 PSI at idle and 60 PSI at cruise speed. Some posts I read, considered that oil pressure to be too high, and could possibly cause damage to the bearings. So I decided to try Castrol 10-30. I went for a drive after the oil and filter change, and now have 18 PSI at idle and still have 60 PSI at cruise. I would have thought the pressures would be somewhat lower, but no joy. I'm sure the engine was rebuilt at some time before I got the car, so is it possible that a high volume pump was installed? Is 60 PSI really too much?

06-17-2021, 09:24 AM	#1
51woodie Senior Member Join Date: Apr 2018 Location: Chelmsford, ON Canada Posts: 529	Viscosity VS Pressure I was running Rotella 15-40 in my stock 59AB, and was getting 20 PSI at idle and 60 PSI at cruise speed. Some posts I read, considered that oil pressure to be too high, and could possibly cause damage to the bearings. So I decided to try Castrol 10-30. I went for a drive after the oil and filter change, and now have 18 PSI at idle and still have 60 PSI at cruise. I would have thought the pressures would be somewhat lower, but no joy. I'm sure the engine was rebuilt at some time before I got the car, so is it possible that a high volume pump was installed? Is 60 PSI really too much?