I can't really tell who's winning the argument, but I have run my truck in many different climates as I travel alot those range from -10 to 110. It's always noisy when it's cold, at least I couldn't tell a difference. I ran motorcraft 15w-40 after purchasing my truck and changed it every 3k, after about a year I switched to T6 @ 5k no additive, I've been running it for two years and have replaced less injectors than I had to with the motorcraft. I personally "believe" the thinner oil is keeping my injectors happy. The best thing to do would be to spend the extra $2.00 per gal. and try it out for yourself then maybe decide if you want to add any kind of additive.
Replaced or Updated: Radiator, thermostat, heater valve, degas cap, Stock Head gaskets, oil cooler, Harley Davidson windshield. ARP studs, STC, stand pipes, dummy plugs, Motorcraft max batteries, turbo oil supply & drain, Blue spring, Fuel/water separator drain plug, interior light LED conversion, Recon smoke LED tail lights, third brake light & mirror lights & added Big rig ice running board and Fire & ice tailgate strip. Other mods: Garrett powermax turbo with riff raff SP billet wheel & boots, Metal CAC tube w/cool it thermo tec aluminized coating, Harpoon, tailgate assist, Drilled/slotted rotors w/ceramic pads, Goodyear Wrangler Duratrac 275/65R20 & Gatorback belt, IPR Generation 2 EGR & up pipe delete. MBRP 5" turbo back SS straight, IPR coolant filter, Rotella ELC conversion Fumoto; oil drain, block drain x's 2, CCV drain. Electronics: PHP Gryphon/Eco, Atlas 40,80,Herc, Edge CTS insight w/EGT, Upfitter switch, high idle mod, JVC KW-NT700, Viper 5904 2-way.