I have a 1990 stang, with a rebuilt 302 with 45.000 mile on it. It runs great. All the gauges read fine but Recently Ive noticed the oil pressure fluctuating once the car warms up, especially when the car is at a stand still. At idle the pressure drops, considerable. I assume the gauge reads from 25psi, 50psi, 75psi, 100psi increments. I noticed it drops fairly low at about 15psi at stand still but when i rev up the engine it goes up to normal.
What can this be? can i make any ajustments to correct this?