1999 jeep cherokee 4 liter straight 6 auto 4x4.
I have owned this Jeep for 2 winters and summers. It runs great. The issue is, everytime it gets cold outside, the oil pressure gage reads lower then normal and drops to zero (or very low) at an idle. Even when it records no pressure, there is oil circulating to the top of the engine and once the warm weather returns, it returns to normal. There are no knocks or ticks associated with this as well. Anyone with ideas?