It does not matter if the engine is hot or cold. Just an occasional flicker of the panel light. I am only questioning this now as my mechanic brought it up to me but when I informed him that it has been doing this (and running fine) for 10 years he was a bit baffled as well. The car does not sputter...

My oil pressure light flickers on and off while idling at a stop sign (not all the time). This has been an ongoing item for +/- 10 years. I had a mechanic look at it and he indicated that the engine wasn't getting enough oxygen at idle for the pressure required. The car sounds just fine at idle even...