Most standard copper spark plugs last 30,000 miles, while higher-performance platinum or iridium plugs can easily go 60,000 to 100,000 miles. The exact lifespan isn't a single number; it depends heavily on your vehicle's engine design, the plug's material, your driving habits, and the manufacturer's specific recommendation.
The type of spark plug is the biggest factor. Iridium plugs, common in modern vehicles, are the most durable due to their hard, fine electrode that wears down very slowly. Following a consistent maintenance schedule is crucial for engine health and fuel efficiency. Worn plugs can cause rough idling, difficulty starting, reduced acceleration, and a noticeable drop in gas mileage.
For the most accurate information, always check your owner's manual. It contains the service intervals specified by the engineers who built your car. Ignoring these intervals can lead to more than just a misfire; fouled or excessively worn plugs can strain the ignition coils and catalytic converter, leading to much costlier repairs.
| Spark Plug Material | Typical Lifespan (Miles) | Key Characteristics | Common Vehicle Applications |
|---|
| Copper/Nickel | 20,000 - 30,000 | Lowest cost, good conductivity, but wears fastest. | Older models, high-performance engines (changed frequently). |
| Single Platinum | 60,000 - 70,000 | More durable than copper, better heat resistance. | Common in early 2000s vehicles. |
| Double Platinum | 80,000 - 100,000 | Platinum on both center and ground electrode for reduced wear. | Waste-spark ignition systems. |
| Iridium | 80,000 - 120,000 | Hardest material, finest electrode, longest lifespan. | Standard in most modern gasoline engines. |
| Silver | 20,000 - 30,000 | Excellent conductivity, but poor durability. Rarely used today. | Some high-performance motorcycles/older European cars. |
