Bosch Platinum Spark Plugs, WR9DPX, Box of 4 Fits: Cadillac, Dodge, Honda, Plymouth, Pontiac, Toyota Full starting power at all times, even in cold weather, or with a lean fuel/air mixture Wider heat range for reliable stop and go driving Maintenance free, resistance to erosion and corrosion means no cleaning or regapping required Top fuel efficiency Features a pure platinum center electrode that's heat-fused into an extended ceramic insulator to eliminate air gaps which exist in platinum alloy-tipped plugs