Quote:
Originally Posted by arpad_m
Cold and warm/hot idle oil pressures are different, which is normal.
With the OEM oil pump, your idle oil pressure should be around 35 psi (235-240 kPa) when you cold start the car, and then it drops to 29-31 psi (200-210 kPa) once the oil is closer to operating temperature (185-195 ˚F or 85-90 ˚C).
In high pressure mode, ie when your requested torque and the resulting engine load are both high (WOT or close to it), you should see 50+ psi (340+ kPa).
These numbers are for the typical oil weights, by the way; if you run 15W-50 track oil, for example, I'm sure they will be different.
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I run 5w50 Rowe oil and the oil pressure is similar to what you state above. Ambient temps range from 15 C to 45C.