Back in the early seventies (or so), I can remember some old-timers talk about using WD-40 for arthritis pain. They swore by it! Then one day I was listening to a radio talk show that had a doctor who was talking about arthritis pain. Someone called in and mentioned WD-40, and the doctor replied that if it did anything at all it was because the skin was reacting to the petroleum, and producing topical heat in the area. Same as applying a hot towel.
Hey, at least it's legal in all fifty states!
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Note to self:
If a road has the word "Hill" included in it's name, it might not be a good idea to try it.