Your car should get a tune-up, or major service, every 30,000 miles. And, this is probably the best preventative maintenance tip a car owner could get. The components of a good tune-up will check into and replace all the things that cause normal wear and tear on your car. If tune-ups are missed, this could lead to damage and further problems that cost a lot more than a tune-up. In addition, tune-ups can give you better gas mileage. Best of all, tune-ups can be done on your own, saving you t.