when i first start the car oil pressure is up around 4 which is fine, i drive gently to allow the engine to warm up.... once its warm it can hold good oil pressure for about 15minutes however after that it drops off really badly
at idle its on 0, then revving up it only gets just above 2 even at 4-5000rpm
my conclusions have been that its not the oil pump as it can hold pressure when you first start the car, could it be related to oil viscocity as the pressure only drops once the oil/engine is very warm.
*NOTE: all readings taken from std gauage*