The mileage of the car hardly matters. with 243K on it you obviously drive a lot--or long distances. So--does that mean starting once or twice a day to log 250 miles -- or 7 times a day to log 50. You--or a shop could do a simple draw test starting up cold. The draw figure will tell you if the starter is struggling. If you must ease your mind over the issue I would only opt for a Bosch brand remanufactured unit. Rebuilts are notoriously chancy--often only replacing totally worn items. The Bosch remanufactured units are truly remanufactered. Find a vendor that carries them. Or--find a good used original and carry a spare.--Dave