NGK manufactures all types of glow plugs featuring the latest in technology. Worldwide restrictions on automotive exhaust gas emission and the promotion of low pollution vehicles are a reflection of our awareness of the need to protect our environment. Not surprisingly, manufacturers of diesel-powered vehicles ultra thin watch are hard at work developing new technology designed to meet increasing restriction on exhaust emissions. Although glow plugs were originally developed as a method for improving the starting performance of diesel engines, technology has developed to the point where glow plugs also contribute to the reduction of exhaust gas emissions.