MY frined comes to me and tells me that his engine died on him while he was at a stop. Uppon further inspection to me it seems that the engine seized up because when we tryed to push start it, once i put in gear the tires locked up.And when i popped the hood i tryed to turn the crank with a ratchet it was seized up. i looked at the engine oil it was overfilled along with the brake, powersteering oil, and coolant. Wat coulve caused it? and wat do i have to do to fix it? replace the motor or just replace the seized up parts