Tips to avoid auto service rip-offs

The maintenance schedule in your car's owner's manual is the automaker's prescription for keeping the vehicle in good operating condition. Those regular check-ups should be performed at the proper mileage intervals. In reporting "How to save hundreds on auto maintenance," we compiled these five auto service rip-offs that all car owners should know:

1. Flushing the engine or transmission. Those are common ways for dealers to pad their maintenance bills. Automakers recommend against flushing the engine.

2. Automatically charging for "severe" maintenance. Some shops assume you need the car's severe-use maintenance service, which typically involves changing filters and fluids more frequently than the regular service schedule recommends. See your owner's manual for details; most drivers need to follow only the normal schedule.

3. Frequently replacing different parts. A mechanic who keeps charging you to replace different parts to solve the same problem is probably having trouble diagnosing your car. Even if the mistake is an honest one, you shouldn't have to pay for it. Ask the mechanic to refund the cost of the first repair, which probably wasn't necessary. Otherwise, replace the mechanic.

4. Replacing the same part over and over again. That might indicate shoddy workmanship or
a poor-quality part; neither should cost you extra. The Internet makes it easy to see whether a
model is prone to certain problems. Search for your model in forums. Check the National
Highway Traffic Safety Administration's Web site for automaker service bulletins and consumer complaints. Also, check John's Tool Box (available to online subscribers).

5. Insisting that only dealerships can perform maintenance. Legally, you can have maintenance performed at any mechanic without affecting your warranty. Just keep thorough records in case of a warranty claim. The only service that needs to be performed at dealerships are warranty repairs, recalls, or post-warranty work that you want the manufacturer to pay for.

Read the full report on how to save hundreds on auto maintenance.