Yep, 5w-40 here in Alaska. Those injectors behave better at 30-50 below zero cold starts.
Along with block heater, dual 1200 amp commercial batteries, oil pan heater and a hair dryer pointed at the air horn. All this run to a single plug-in. 2 hour plug-in 25 below zero or colder. White Rodgers glow plug relay replacing that worthless motorcraft relay as well.
Diesels in interior Alaska are pure stupidity. Next work truck will surely have a gas engine.
