pisspodpete, HOT engine oil pressure at idle is pretty unpredictable (that's why most oil pressure readings are taken at a higher rpm). Just a couple of RPM's difference in the engine idle speed can have a big effect on oil pressure. Even oil brand can effect hot oil pressure as not all 20w50 oils have the same base viscosity (some run to the high side on theviscosity index while others are much lower).87 Appy, what is the oil pressure at idle and at running speed? I have a pressure gauge now. At start up 60 psi. When warmed up 6 psi at idle, 40 to 50 at 3000 rpm and up.
20-50 wt. oil. Any need to be concerned about 6 psi?