the last thing you want to do is put synthetic in your car. please please follow my advice and just use regular oil. synthetic oil is for new cars or cars with very low mileage. ive had plenty of friends put synthetic in their high mileage cars, and it bleeds right through, sometimes taking the head gasket with it. you might be able to get away with a sythetic/regular oil blend.g200sx said:i have a 1997 240sx with 122,000 miles on the odometer. what would be the best oil to use? regular motor, synthetic or a synthetic blend?