Well it also depends where you take the messurements.
25 psi is adverage in the heads i have come to find out...but for a more accurate readings you want it in the block i believe its behind the bracket for the ac compressor or the alternator...from what i understand from there psi is between 40 and 45.
weight of oil your using is also a factor a higher weight will raser oil pressure.
the numbers i have given you are with 5w 30 weight.
Lupe
