Trustworthy Advice:
What kind of spark plugs should I use?


Spark plugs are a key component to your engine, and come in four basic varieties: copper, platinum, double platinum and iridium. The most important detail in a spark plug is matching your engine’s design. Copper has high conductivity and low price, but also a shorter lifespan. Harder platinum and iridium plugs cost a little more and tend to last longer, but the best fit is always the one designed for your engine. You need the metal that meets your vehicle’s needs, so stick with your owner’s manual recommendation for the best performance. If you don’t have an owner’s manual, you can always consult with your local AutoZone store.

If you want to protect your ride, stick with what’s in the guide.
  • Copper

    Copper plugs have a solid copper core with a nickel alloy electrode. Nickel is softer than platinum or iridium, and has a shorter life. These plugs are usually best for older, low-voltage systems. Because of copper’s high conductivity, some high performance vehicles require them.

  • Platinum

    The hard platinum metal in the electrode of a platinum spark plug allows it to last longer than a copper plug, retaining its edge better. Due to temperature resistance, platinum spark plugs tend to run hotter, preventing fouling and buildup of deposits. These are usually best for newer vehicles with electronic distributor-based ignition systems.

  • Double Platinum

    Features two discs to accommodate a backwards-jumping side-to-center spark. Because sparks are allowed to fly in both directions, double platinum spark plug electrodes don’t wear as fast. You don’t want to install single platinum plugs if your owner’s manual recommends a double platinum spark plug.

  • Iridium

    Harder than platinum, and, in most cases, lasts about 25 percent longer than platinum spark plugs of similar design. Iridium plugs usually feature the smallest diameter center, which can increase efficiency by reducing voltage needed to create a spark. Also famous for continuing to fire under extreme conditions. If your manual specifies iridium spark plugs, best practice is to absorb the extra cost associated with this rarer metal for best performance.