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Head now spinning off it's axis............
AMSOIL HDMP is the way to go. Raptor owners have been running it for years on this forum. I lived in Idaho/Montana and my frame was in great shape after coating it yearly.
Is that a DIY application or applied by a shop?
It is DIY. It comes in a can and you simply spray it on. It really is a great product. You can use it on battery terminals to prevent acid build up. You can also spray it on nearly everything underneath your vehicle: shocks, leaf springs, UCA, spindles, tie rods, frame, hitch, and so on.
I would also highly recommend AMSOIL fluids as well. I have a 2014 with 90k miles and my truck runs and shifts just like it did when I first bought it. I have everything switched to AMSOIL from engine oil, tranny and differential oil, radiator fluid, and even power steering fluid lol. Whatever vehicle you end up buying—regardless of how low the miles are—you need to change the diff fluids, transfer case fluid, transmission fluids and so on. With regularly service, a Gen 1 will last a long time as there are very few things to go wrong.
Fluid film. If its good enough for the Navy to use on their aircraft its good enough for me.
I don't think that rubberized stuff is good for used trucks, it essentially seals in everything. Unless you have a perfect frame with zero oxidation or corrosion and the coating is literally perfect then it will accelerate the process.
Just make sure to let the truck sit for at least 5 to 6 hours before driving it. You don't want the AMZoil mist go over your paint or windshield.Is that a DIY application or applied by a shop?