How often should I replace my spark plugs? Unfortunately, there is no single answer to this question. As spark plugs grow older, they lose their sharp edges as material from the center and ground electrodes is slowly eroded away. As the gap between these…

Power Equipment Spark Plugs Did you know there are several different spark plugs for power equipment applications? With so many spark plug options, it is very important to use the correct spark plugs for each application. Grouping all power equipment…

Decoding Spark Plug Part and Stock Numbers Did you know every NGK spark plug has both a plug number and a stock number? Only the plug number is labeled on the spark plug, while both are printed on the box. The plug number is used to decode the spark plug…

Waste Spark Ignitions Like most automotive systems, the ignition system has undergone many changes. One example is the Distributorless Ignition System, or “DIS” for short. This system introduced in the 1980s. The distributor, coil, cap and rotor the…

Iridium IX® vs. OE Iridium Spark Plugs NGK builds two types of iridium spark plugs: OE Iridium and Iridium IX®. Every plug in the Laser Series was designed for an OEM application. All dual precious metal plugs are designed to provide maximum longevity.…