Park this car on a level surface and check the oil level after the engine has not been run for 1 hour. If you find that it is overfull, remove the excess oil immediately. Running an engine with too much oil is just as bad as running it with too little. Too much oil will cause the oil to cavitate, and air bubbles will be created. This will create severe engine damage from lack of lubrication. If you find this not to be the case, take the car to a professional for diagnosis. Running it with a emissions problem, (Check Engine Light) may or may not do damage. Depends on what has caused the light to come on.