A few days ago it got down to - 8 degrees here in the mountains of NM when I went to start my Ford F-350 6.7 diesel I hit the glow plugs just until the light went out , about 5 seconds and the truck s...
One of the reasons the 7.3L and 6.0L weren't great cold starters was the oil fired injectors. I actually had to cycle the glow plugs on my 6.0L in the summer or else it would start very poorly if at all.
Now my current 6.7L Cummins is another story; I rarely use the grid heater and it fires up quickly and smoothly every time. :B