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Are you talking about Boschs for 12 volt system use or 24 volt system use? Civilian type 12 volt systems originally used 6 volt glow plugs (like 9G Delcos) and military 24 volt systems use 11 volt plugs (like 13G Delcos). I like the Wellmans/WAPs for a 12 volt glow-system. GO50s. They've...

Yes if a tip tears off, burns off, or blows off - it can make a mess. That being said, the OTC tool helps with some of the bad ones and sometimes will make the difference of getting out a stuck plug in one piece that otherwise would have busted apart. With some of those plugs it's near...

Twisting and pulling- carefully. For the real bad ones - OTC and Navistar make a good tool for getting them out. Not quite worth buying one for $80 unless you do this full-time. Works nice though if you can borrow one.