What is a common characteristic of long-life spark plugs?

Long-life spark plugs are designed to last longer than standard spark plugs, which is primarily achieved through the use of more durable materials for their electrodes. Platinum and iridium are two such materials that have superior resistance to wear and corrosion. These metals allow the spark plugs to maintain effective performance over a greater lifespan, typically ranging from 60,000 to 100,000 miles or more, depending on the specific vehicle and spark plug design.

Choosing platinum or iridium for the electrodes ensures that the spark plugs can withstand the extreme temperatures and pressures within the combustion chamber without degrading quickly, making them ideal for vehicles requiring longer service intervals. This characteristic distinguishes long-life spark plugs from standard ones, which are often made with copper and are more prone to faster erosion.