The usage time of dual-iridium spark plugs depends on the mileage of the car. Compared with resistance spark plugs and platinum spark plugs, dual-iridium spark plugs have the longest service life, about 80,000 to 100,000 kilometers. If they are well maintained, It can be longer. The spark plug is an important component of the gasoline engine ignition system. It can introduce high-voltage electricity into the combustion chamber and cause it to jump across the electrode gap to generate sparks, thereby igniting the combustible mixture in the cylinder.