I had taken this picture a while back. it shows the OS F and OS G5 plugs adjacent to each other. Also the Fox Miracle plug and the OS P3 Turbo plug too.
You will note that the OS G5 plug is a little bit more long in length than the OS F plug. It isn't much, but it could be a problem in rare cases with some engines.
The OS G5 and OS P3 Turbo plugs both are ultra-hot heat range glow plugs that work well with gasoline instead of methanol.
Last edited by earlwb; 09-10-2015 at 04:39 AM.