What's the mileage? Your oil pump may be getting tired producing decreased pressure at idle. However, if it pegs once you put on some revs, then you're probably OK. My '89 sit somewhere slightly above zero, but if you put a real pressure gauge on, I'll bet you'll see at least 20 PSI, which is more than enough at idle. Don't forget, that gauge is not a very precise instrument..
1987 BMW 325
[This message has been edited by jeffsr (edited 06-09-2000).]