If your local dealer is making a vehicle warranty contingent upon the use of their products, there may be a violation of Federal Law.
Under the Magnuson-Moss Warranty Improvement Act, a vehicle manufacturer may not make its vehicle warranty conditional on the use of any brand of spark plug (or other article or service) unless the manufacturer provides the spark plugs (or other article or service) free of charge or the Federal Trade Commission (FTC) has specifically published that only the vehicle manufacturer’s product is needed. To challenge a false claim, ask the person to put it in writing or request the original equipment spark plugs free of charge. If you are charged for the spark plugs, or they refuse to give you a written statement, there may be a violation of Federal law.
You may also want to refer to the Federal Trade Commission Web site: www.ftc.gov for detailed information on the Magnuson-Moss Warranty Improvement Act.
As a spark plug manufacturer and not an automobile service facility, professional liabilities prevent us from providing instruction on specific spark plug removal and installation. Spark plug installation may require the removal of engine components and may require that specific vehicle manufacturer procedures be followed to ensure proper service and safety. It is recommended that you follow the instructions listed in the vehicle service manual or as instructed by your local vehicle dealer or a reputable mechanic for specific spark plug service and replacement.Quick Tips on Changing Your Plugs: