Glow Plugs feature precisely placed heating coils and magnesium heating rod tips that work together to warm diesel engines for instant cold starts, even in freezing weather. A set can lift a diesel-powered vehicle engine from zero to operating temperature within seconds, reaching peak performance efficiency faster, protecting the engine from wear. Plugs boast a 12-month/100,000-mile warranty. BorgWarner Turbo & Emissions Systems, a div. of BorgWarner Inc., Auburn Hills, Mich.