Regardless of whether spark plugs are made of iridium or copper, no spark plug will last forever. Depending on the type of plug, they’ll last anywhere between 45,000 and 100,000 miles.
Every time a spark plug fires and the high voltage current jumps between two electrodes, it wears away a little bit of metal from both of them. This increases the gap between the center electrodes and the side electrodes. As the spark plugs age, the sharp edges on the center electrode will become rounded and dull also.
Over time, as spark plugs wear, more voltage is required to jump the gap, causing your engine to run less efficiently. If the ignition system can't deliver the required voltage, the spark plug may begin to misfire. Also, sometimes, deposits can accumulate on the tip of the plug and reduce ignition ability. Usually, by the time the average copper spark plugs have run 45,000 miles, it's time to replace them. The “long-life” spark plugs made of iridium, platinum, or gold-palladium alloys will usually last longer, often 100,000 miles, under optimal conditions.
Changing your vehicle’s spark plugs periodically, even the “long-life” plugs at some point, will help maintain proper firing conditions for the engine ignition and keep your vehicle running efficiently.
The ASE-certified technicians at BRAKEmax Tire & Service Centers can check and replace your spark plugs as needed and help keep your vehicle’s engine firing properly. Book your appointment today!