How Often Should You Change Spark Plugs? (By Engine Type)

One of the most common questions from car owners: how often do spark plugs actually need replacing? The answer depends on the type of plug and your driving conditions.

Copper Spark Plugs

Service interval: 20,000–30,000 miles

Copper plugs are the most affordable but wear the fastest. They're common in older vehicles and some performance applications. If your vehicle uses copper plugs, plan on replacing them more frequently than other types.

Platinum Spark Plugs

Service interval: 60,000 miles (single platinum), up to 100,000 miles (double platinum)

Platinum plugs significantly extend the replacement interval. Most modern vehicles from the late 1990s through mid-2000s use platinum as the factory specification.

Iridium Spark Plugs

Service interval: 60,000–100,000 miles

Iridium plugs are standard on most vehicles built after 2005. They offer the longest service life and best performance. Many manufacturers (Toyota, Honda, GM, Ford) specify iridium OEM plugs with 60,000–100,000 mile change intervals.

Factors That Shorten Plug Life

• Turbocharged or supercharged engines (higher heat and pressure)
• Towing heavy loads regularly
• Lots of short trips (engine never fully warms up)
• Oil burning (contaminates electrodes)
• Running rich (excess fuel fouls plugs)

The Bottom Line

Always follow your owner's manual interval. When in doubt, inspect the plugs — the electrode tells a story about your engine health.

Find the right plugs for your vehicle at Texan Supply with free shipping.