Its 49*F. My 36 year old tractor with 12,000 hours on it starts up just like that with only 5 seconds of glow plugs. (mine doesn’t have glow plugs, its called “thermostart” and you’re suppose to run it 30 seconds when its 32*F (0*C) instead of the 10-15 second glow plugs.) I would bet my life this tractor would start at any temperature that pure antifreeze and diesel with Heet treatment in it isn’t frozen.
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[youtube QEj27ONeruw]