Auto Mechanic Gapping Spark Plugs with feeler or wire type gap gauge. Properly gapped spark plug will last roughly 70,000 miles, depending on the material, before it needs to be replaced. The distance of the gap on a spark plug depends on the voltage & amperage generated by the ignition coil. Gap specification is determined by the vehicle manufacturer during design & found in the vehicle owner’s manual or emission sticker. Always measure the gap to ensure maximum efficiency & longevity.
