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[jsmichael]

He should definitely get the Winter Grille Cover to keep snow out of the air intake while driving down the road. It might not hurt to purchase a spare air filter to keep in the truck if he's not going to use the cover.

It also doesn't hurt to add diesel fuel supplement from time to time. I use Power Service Diesel Fuel Supplement® +Cetane Boost® at each fill-up. Amsoil and Stanadyne also make good additives.

If the weather forecast says that the temps are going to be below zero for the following morning, then I'll plug my truck's engine block heater in and let a timer kick it on about two hours before I have to start the truck.

Speaking of starting the engine on cold mornings, I prefer to run a synthetic oil, which in my case is Amsoil, during the winter, but I know some people will run a 15W-40 conventional oil year-round in cold climates and not experience any problems.

Finally, if his truck didn't come with tires with decent traction on snow-covered & slippery roads, then I would get new tires to handle the slippery roads. I have Goodyear Wranglers, but BF Goodrich and Michelin also make good tires for winter driving.