That sux, but yeah, if the oil light did not go off once you added oil it should never have been driven, in my experience the oil light is not controlled by the computer, but rather a physical sensor, if it is on=no pressure, or no oil, either way driving with that light on is a no no. If you are going to pull the engine, maybe invest in an overhaul kit and just re-do it? Or go used engine route....or buy a different car, a Toyota perhaps. anyway, sorry this happened, it is bizarre how cars seem to "know" when you have extra $, but on the bright side, at least you have it. Get a full understanding of the failure before you waste too much time/money on it.