I knew about sperm oil, as it was often used by old time clock makers, though it has long since been replaced by modern much better lubricants, especially synthetic. I have training in antique clock repair, and have done quite a bit of that sort of thing, so early on I learned about the sperm oil. Rangoon oil in nothing like that, and, indeed, it was developed for the British military, especially for the preservation of gun metal. I recently saw an empty can of Rangoon oil dated in the 1850s, so it has been around a bit longer than any of us, and is still available today. Thanks for the interesting information---one can't have too much knowledge!