When I start my truck the oil pressure is great 65-70 psi. Then after the engine has reached temp, the pressure starts dropping. At idle the pressure gets as low as 8-10 psi. When I rev up to 3000 rpm the pressure goes up to to about 30 psi. I have verified these pressures with a mechanical gage so it is not the sending unit. I have also replaced the oil pump and checked the intake screen and pick-up tube. Is this a main bearing clearance issue? I'm currently using 10W30 oil, should I switch to 15W40, 20W50, or straight 30W? Also, I have noticed that the engine smokes more during and right after idling. Thanks for the help.
have the same problem?
Monday, March 31st, 2008 AT 11:47 AM