When putting anything new in your Chrysler, Dodge, or Jeep® vehicle you want to make sure you're adding the best parts available. And when using parts like Mopar/Champion Spark Plugs you know you're adding the best.

For a more complete description of the benefits of using Mopar replacement spark plugs, see "The Mopar Difference".

A spark plug performs many functions within your vehicle's engine. Primarily, it provides a spark to initiate the combustion process and remove heat from the combustion chamber. When interpreted correctly, spark plugs are valuable tuning tools. The appearance of a spark plug's firing end reflects the suitability of the spark plug as well as the engine. By evaluating the plug's visual cues, you can accurately determine the engine's overall operating condition, get a feel for air/fuel ratios, and even diagnose driveability problems.

Refer to "Inspection Tips" and see how your spark plugs measure up.

When replacing your spark plugs, first refer to the mileage intervals listed in the vehicle owner's manual. Then look for these signs when replacing them:

• Select the shell type based on thread diameter, length, and seat type required by the cylinder head.

• Select a gap style to maximize performance based on your operating environment. The more the spark gap is exposed to the air/fuel mixture, the easier it is to initiate combustion. This translates into improved throttle response and more efficiency.

• Select a heat range that corresponds with the required shell and gap style.