I have a 2003 Chevrolet K2500HD crew cab, short box with the LB7 (of course) and my oil pressure at idle when the motor is warm only reads 125KPA (18psi). The oil pressure at idle when the truck is cold is 400KPA (58psi) or so. However as soon as the accelerator is touched the oil pressure shoots up as more gas is applied ie. the oil pressure can get as high as 600KPA (87psi) when the motor is cold, when the engine is warm it can read as high as 425KPA (62psi). What could be causing this problem?