The 18-point prep
Batteries load-tested, terminals clean, glow plugs/grid heater function, block heater + cord, winter-blend or anti-gel additive, fuel filter changed, air dryer + tank drains, DEF heater function, coolant freeze point tested, antifreeze concentration, hose + belt inspection, tire condition + chains carried where required, wiper fluid (de-icer), defroster function, mirror heat, emergency kit (blankets, food, water).