GM Genuine Parts Glow Plugs are designed, engineered, and tested to rigorous standards, and are backed by General Motors. ACDelco Professional Glow Plugs are specially designed to give diesel engines the heat they need for cold starts, and are a high quality replacement for many vehicles on the road today. They maintain ignition in all cylinders, optimizing throttle response. These premium aftermarket replacement glow plugs are manufactured to meet or exceed your expectations for fit, form, and function. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).