How often do you do that? I would think it doesn't cling for very long. Would doing the same thing with something like Zero Rust or undercoating work better?
I do it every other year, just before winter sets in. Undercoating won't seep into the pinch welds like oil will. Once you squirt the oil in there it will remain oily, repelling water and salt for years. Undercoat stays put, hardens, cracks and will lift off the steel actually helping trap water against the steel. The oil will run into areas you will never get undercoating to go. I've been doing this for 35 years and know it works. I had a '74 Powerwagon that got this process, the only place it rusted was the floors, couldn't oil them. My '01 Dakota has absolutely no rust on it while nearly all other Dakota's in my area are rusted up. This works and the oil is free, do it and see for yourself.
