my last truck i bought brand new, a 2016 ram 3500, i brought it to Krown oil spraying they use a proprietary blend that over time is soaked into the steel, or so they say. i oil sprayed my 3500 twice in the first year of ownership and every year after that and will do the same with my bronco. i believe their system works because when i had my truck there i witnessed quite a few older cars that should have rusted out by now, like K cars. not to mention my part of Canada has started using a brine solution instead of salt/sand, that brine gets into everywhere. i even got them to drop my spare tire and spray into that opening as well.That's my biggest concern is rust rot with the box framing. I live in the rust belt. What's the best way to make this thing last more then 10 years? I've done undercoating before. after time it just hides a problem you can't see until it's to late. I know the old timers would spray old motor oil on them and ride down a dust road. wonder if that's better then undercoating? I once know a guy that took vaseline an put it on the body like wax and left it on all winter. That old truck lasted a long time, but he put it on the painted outside.
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