Review on 🔌 ACDelco 61G / 9G Professional Glow Plug (1 Pack) by Jason Lockwood

Great replacement, good price. I threw away code #8 and tried to change it on a hot day, so I did it in the morning with the engine cold. Big mistake. Broke it (do not need much). These are hollow steel plugs in an aluminum head that they can jam. More research later. The engine must be warm. Always use penetrating oil the night before on a hot engine. This will help hold onto the threads. Spray again, warm up, and they'll get a lot better.