Low Oil Pressure
My '88 Escort's oil pressure starts out normal on a cold engine, but as the engine temperature increases and the oil thins down the pressure drops to near 0 at highway speed. I've changed the oil filter thinking maybe it was clogged or damaged, and have removed the oil pressure line and confirmed oil flow on a cold engine. I am now thinking the oil pump may just be worn and not picking up the oil after it thins, so I wanted to post this information and see if anyone else has other suggestions before removing the oil pan and replacing the oil pump. I've currently got the car parked waiting on warmer weather to work on it. I'm also getting a ticking which sounds like a lifter or valve tick both on cold and warm engine which also leads me to believe it's the oil pump.