All right guys, what would cause a drop in oil pressure when the engine is idling? By drop i mean someplace between the first mark (I beleive that is 20 psi, but its not labeled) and 0 psi. When the car is under load, the pressure hovers between 20 and 40 psi which is a little low according to the owners manual. Its a 91 Turbo with 177K on the original tranny and turbo, if you need any other info let me know. Thanks in advance for the help