I have a 2000 wrangler, 4.0 inline 6. A couple of weeks ago I parked at work and the check engine light came on. The oil pressure had bottomed out. Rev'd the engine and it went back to around 20lbs. This continued fir the next week or so every time I stopped at a red light or parked. I changed the sending unit thinking that would do the trick, but still had the same problem. Today I checked the pressure with a manual gage and it was in fact losing pressure at idle.(hoping I just had a bad dash gage) I was told that Chrysler had, in the past, put a coating on the inside of the oil pan and that it has been known to flake off and cause problems, but seems to me like if that was the case, it wouldn't gain pressure when the engines rpm's were increased! Anyone else experienced this issue?