Denso Spark plugs for MERCEDES-BENZ S600L 5.5

– 0.4mm Iridium Tipped Laser Welded Fine Wire Center Electrode

– Tapered Cut U-Groove Ground Electrode Increases ignitability and decreases quenching.

– Machine Rolled Threads Prevent seizing or cross threading during installation and removal

– 100% pre-fired to assure highest quality possible

– Purified Alumina Powder Insulator provides exceptional strength and thermal conductivity

– Five Rib insulator prevents flashover

– Copper-Glass Seal bonds center electrode and insulator for a Gas-Tight seal.