Do Car Spark Plugs Last 100K Miles?


Car spark plug designs have come a long way over the past 150 years since Belgian engineer Jean Joseph Étienne Lenoir used a Ruhmkorff induction coil to jump the spark that ignited distilled coal gas in his Lenoir 2-Stroke engine. In those earliest days of automotive development, a wealthy Frenchman could expect to get 10 kilometers or more before the disruptive discharge system needed routine maintenance. Today, a standing joke among auto mechanics is that you need to change your car’s spark plugs when you have your muffler bearings greased . . . meaning never. However, all jokes aside, there are a number of reasons to have your car spark plugs checked more often than every 10 years or 100,000 miles.

Although most cars and trucks use a 12-volt DC battery as an initial source of energy, the ignition system’s coil increases the low voltage input to a high voltage discharge by one to two thousand times. This high energy flow of electrical current sparks across the gap between the plug’s central and ground electrodes. The increase in the temperature of the compressed gas/air mixture results in a small explosion in each combustion chamber for every firing cycle of the engine. So, the actual road mileage for any spark plugs lifecycle is based on numerous variables such as the weather conditions, how the engine is used, the additives in the fuel, etc. In other words, it’s probably a good idea to check your car or truck spark plugs more often than every 100K miles.

Since most of today’s automotive engines use electronic ignition systems, the modern day tune-up is basically limited to changing the car spark plugs and replacing the motor’s air filter, or servicing the P.C.V. (positive crankcase ventilation) valve. Most experienced auto mechanics recommend that these items be inspected every 30,000 miles. Anytime that you notice a loss of engine power or reduction in fuel mileage, then an unscheduled tune-up should be considered to prevent more permanent damage to your motor. When your engine is misfiring or not running properly, excessive heat can leave the plugs worn or galling of the plug’s threads can occur in the motor’s cylinder head. This could potentially cost the owner much more in repair charges than the costs of routine engine maintenance.

E3 car spark plugs come with a 5-Year or 100,000 Mile Warranty from the date of purchase, as long as your vehicle is used for personal or family purposes. Our goal is to always provide you a positive driving experience with more power on less fuel, quicker starts and less fouling than our competitor’s standard spark plugs. This way, your car or truck spark plugs are guaranteed to be free of defects in material or workmanship and you’ll have a good reason to service vital engine components in a timely manner. For additional information about E3′s patented DiamondFire Technology or Combustion Cycle Analysis, visit any of our E3 portal websites for car spark plugs, truck spark plugs, motorcycle spark plugs, snowmobile spark plugs or lawn & garden plugs.

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