They started to do the Crown Spray on the military trucks just before I got out of the military. It did not seem to me to be much different than the spraying of used motor oil in Ontario decades back.
You can buy a oil spray gun from princess auto for around $20. Spray the under chassis of the mutt with 30 weight and you should be good. You can even pull some of those ziebart plugs in the frame channels and spray oil into there.
There was a patch of rust on my current M38A1 at the front right pillar and at the bottom edge of the right side from water in the tool box. I sprayed both these areas with motor oil and it stopped any further deterioration dead. I am just finishing up the restoration of an old 5/4 ton, and plan on spraying the underneath of the cargo box with 30 weight as well. I don't really have to do under the cab so much....being a chevy it has the auto oiler (350 V8 and the turbo 350 tranny) looking after that floor.
A wise body man once told me that anytime you go into a door to work on things like door handles or window mechanisms, you throw an oil soaked rag into the bottom of the door. Anytime you are back in their, you re-soak it. A little oil goes a long way, and is relatively cheap.
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