Re: Oil light: Driving a car into the ground
I've had two cars that would do that same thing, having the oil light flicker at idle, when fully warmed up. The first was a 1967 Pontiac Catalina. It only came from the factory with an idiot light for the oil pressure, but there was an aftermarket gauge hooked up to it. Once it was fully warmed up, it would idle REALLY low, and the light would flicker. I think it would do it around 15 psi. Pontiacs back then were known for idling low, but I think someone messed around with the idle on this one. I bumped up the idle a bit, and my mechanic recommended running 20W50 oil in it, and never had a problem since.
My 2000 Intrepid started doing the same thing about 2 1/2 years ago. It turns out there was a TSB on it. There was some kind of issue where the sensor can get too hot and trigger a false reading. Usually at idle, fully warmed up, where it's going to be hot with no airflow to dissipate the heat. The scary thing about the Intrepid though is that it actually acted like there was a real problem. If I put it in neutral and tapped the gas to boost the revs, the oil light would turn off.
I'd say if it's only doing it at idle, you might be able to get away with putting the car in neutral when you're stopped at a traffic light or similar situation. That'll take the load of the transaxle off the engine, and it'll rev up just a bit. Maybe enough to make the light go away.