Spark Plug Specifications by Vehicle & Engine — CarFactBook

Spark plug replacement: the questions to answer first

These manufacturer-referenced records describe specific engines and equipment. They are not a universal step-by-step replacement procedure; always use the service instructions for the engine in your vehicle.

How do I know which spark plugs fit?

Identify the actual engine, model year, market and original equipment specification. A plug listed for another engine in the same model family may not have the same specification. Follow the source link on each exact-code answer and confirm the replacement part against the vehicle's service information.

How often should spark plugs be changed?

Replacement intervals depend on the engine, plug design and applicable maintenance schedule. Do not infer an interval from another vehicle, or from the gap specification alone. If the manufacturer interval has not been independently verified for your configuration, check the original maintenance schedule.

Can I follow one generic "how to change spark plugs" guide?

No. Access, removal sequence, installation torque and precautions vary by engine. An incorrect part or installation can damage the engine. A guide should be published only after its exact service procedure has been reviewed. For a documented example of why engine identity matters, see our 2024 Ford F-150 plug-gap comparison by engine →. Read the engine-specific pre-replacement checklist →