Double Platinum Spark Plug

The AUTOLITE Double Platinum Spark Plug (SKU: AUTAPP5263) is a premium ignition component engineered for drivers seeking reliable engine performance and extended service intervals. Designed with a 14mm thread diameter and 1-inch reach, this tapered-seat spark plug fits a wide range of automotive applications where OEM or performance-level ignition is required. Double platinum electrodes deliver superior durability compared to single-platinum alternatives, making this plug ideal for both stock engines and those expecting extended maintenance schedules.

Double platinum technology uses a platinum alloy on both the center and ground electrodes, significantly reducing electrode erosion and extending plug life to 60,000–100,000 miles depending on engine conditions and driving habits. The built-in resistor suppresses radio frequency interference (RFI) and electromagnetic interference (EMI), protecting vehicle electronics and reducing spark scatter that can degrade ignition consistency. The tapered seat design ensures a reliable gas-tight seal without requiring a gasket, simplifying installation and reducing the risk of exhaust leaks around the plug seat.

Mechanics and vehicle owners operating passenger cars, light trucks, and crossovers benefit most from this resistor-type plug, particularly in engines with electronic fuel injection and advanced ignition systems where RFI suppression is critical. Installation is straightforward: gap verification (if necessary per engine specs), careful threading into the cylinder head, and proper torque application ensure optimal sealing and performance. Always verify thread pitch, reach length, and heat range compatibility with your vehicle's service manual before purchase to ensure correct fitment and avoid potential engine damage.