PEH,

I concur completely. The loss of the second glow plug is the kiss of death. I really cannot figure out how I lost two glow plugs at the same time however. The dash light was working fine and the vehicle was starting just fine and then, one 12 degree morning at a hotel no less, nothing. No light, no start.

I replaced the #1 glow plug the next day from one I had on the shelf and it runs fine again. I ordered and received another plug for #4 but have not installed it yet because of no need. However, since I am on borrowed time, I probably will not dawdle any more.

Do you use anit-seize when you install them? I seem to recall one poor fellow who broke one off at the top of the threads.

Brian Carlton
1984 300SD