Autolite Copper Resistor Spark Plug Fits select: 1986-1991 MERCEDES-BENZ 560, 1970 CADILLAC DEVILLE

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed OES design requirements. Consider upgrading to Autolite Platinum, Double Platinum or Iridium XP plugs for improved engine performance. Copper core plugs are the industry standard.

Autolite Copper Resistor Spark Plug 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 Electrode Tip Material : Resistor Reach : 3/4 In Resistor : Suppressor Seat Type : Gasket Thread Diameter : 14 mm Tip Configuration : Power Wrench Diameter : 13/16 In