Acdelco 41-110 OEM Gm 12621258 Professional Iridium Spark Plug - Set of 4

AAlways buy OEM(Original Equipment Manufacture). They will fit, function and last longer. There are plugs out there that are not made from the same materials as OEM. These are OEM.... Competitive Crosses: Bosch 7421, Bosch HR9LI33U, Champion 2103, Champion 2015, NGK TR4IX, NGK 7300, Autolite XP5245...Iridium is one of the hardest metals used in spark plugs today, which allows for smaller, more efficient electrode designs for improved cold starting and quicker acceleration Latest evolution in high-performance plug electrode material Improved cold-starting and acceleration characteristics Reduced ignition system voltage demands saves wear and tear New-vehicle applications using iridium plugs continues to increase Iridium tip for maximum resistance to spark erosion and corrosive combustion chamber environment One-piece integral suppressor seal meters spark plug energy to help provide long electrode life and seals against compression leakage Spark gap remains virtually unchanged during the life of the plug for increased fuel efficiency 12-month/12,000-Mile Limited Warranty ACDelco is an Original Equipment (OE) supplier and has the experience engineering and manufacturing components that achieve the highest quality standards required by vehicle manufacturers. FUNCTION:Uses a high-voltage spark from the ignition coil to ignite the air/fuel mixture inside the engine's cylinders.. SIGNS OF WEAR:Poor starting characteristics, decreased fuel economy, sluggish engine performance, excessive foiling or deposits on plug.. WHAT IT DOES:The Starting and Charging System starts the engine, maintains the battery's charge and provides power to the electrical accessories while the engine is running.