Iridium spark plugs typically last 60,000-100,000 miles depending on driving conditions. Check your owner's manual for specific intervals. Signs of worn plugs include rough idle, poor acceleration, and decreased fuel economy.

Iridium plugs feature a much finer center electrode that concentrates spark energy better than copper. This results in more complete combustion, better fuel economy, smoother idle, and significantly longer service life - often 2-3x longer than copper plugs.

ACEON iridium spark plugs come pre-gapped for most applications. However, always verify the gap matches your vehicle's specifications before installation. Use a feeler gauge to check - never use a wire-style gap tool on iridium electrodes as it can damage them.