Autolite Copper Core Spark Plug, Resistor Fits select: 1988-1991 BMW M3, 1989-1990 CHRYSLER TC

Autolite Copper Resistor Spark Plug Autolite Copper Core spark plugs deliver quick starts, good fuel economy, and smooth acceleration. The copper-glass seal bonded insulator, terminal post, and center electrode ensure a tight seal that is 100 percent leak-proof, and the full copper core electrode improves heat transfer and optimizes plug life. Copper Core spark plugs feature high alumina ceramic for high dielectric strength, and a steel shell for installation robustness. The multi-rib insulator reduces the danger of “flash-over” to prevent misfires, and the copper core center electrode provides higher thermal conductivity. These spark plugs are engineered with a high nickel alloy center and ground electrode for extended life. Features and Benefits: Copper-glass seal bonded insulator, terminal post, and center electrode provide a tight seal that is 100 percent leak-proof Multi-rib insulator reduces danger of “flash-over” to prevent misfires Full copper core electrode improves heat transfer and optimizes plug life Copper core center electrode provides higher thermal conductivity Features high alumina ceramic for high dielectric strength and steel shell for installation robustness Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof) Multi-rib insulator reduces danger of “flash-over” One-piece terminal post adds strength Resistor reduces radio frequency interference (RFI) and electrode erosion