Alan, Seeing how you do not know the history of this car why not drop a bottle of Auto-Rx in the oil and run it to 3000 miles! Flush it with a decent 10W40 or 15W40 for 1800 miles then go to Mobil 1 0W40. This way you do not have to try to clean up the engine with the oil. You will be starting fresh with a nice clean engine.