97 Honda civic, 165,000 miles. Symptoms: The car burns A LOT of oil, like more than 1 quart every 3k, for no good reason. No change after replacing valve stem seals. I doubt it's the rings because I have felt a pressure loss going up-hill once before, and the engine seems to perform poorly in hot weather. The engine also hiccups during a cold start. The cooling system seems to be getting bubbles in it, throwing off the IAC valve. (it was throwing a code recently) There is very little coolant loss, but there is some. I bought this car at 90k miles in L.A., and the owner did not take care of the car. The cooling system was rusting because of running only water, but I managed to restore it. I suspect the engine was overheating a bit and it could have a slightly warped head. At 90k, it wasn't burning much oil, but it has gradually increased.