Low Oil Pressure - oil warning light comes on at stoplights and low speed.

What is your question?

A mechanic told me my car (1989 240 wagon) is "a heart attack waiting to happen), said he checked the oil pressure with a gauge and that it's low and he has no idea why, that it's "rare" for these vehicles but that I "should stay close to home." It is absolutely not a wiring issue. What should I do? The car is running fine - new rattling sound to left of steering wheel, like plastic is loose in there, but that's it, nothing new.