Autolite AP646-4PK Platinum Spark Plug, Pack of 4

• Full platinum tip ensures virtually no gap erosion for long plug life
• Yttrium enhanced, high nickel alloy side electrode maintains precise gap to increase plug life
• Necked-down center electrode fires quicker and cleaner, with less voltage for easier starts, quicker acceleration, and improved fuel economy
• Platinum alloy pad on ground electrode provides extended durability and service life and platinum-to-platinum firing
• Nickel-plated steel shell for long-life corrosion resistance

Autolite Platinum Spark Plugs feature a center wire platinum firing tip for reduced gap erosion, fewer misfires, better performance, and more durability. These spark plugs also feature a high nickel alloy side electrode to maintain a precise gap, and a full platinum tip to ensure virtually no gap erosion. The necked-down center electrode fires quicker, cleaner, and with less voltage for easier starts, quicker acceleration, and improved fuel economy. Guaranteed for 4 years.