On the oil type, I've heard of guys using vegetable oil, because if it leaks it won't pollute, and it's thin enough. Olive oil sounds good. I like the idea of testing it with water in a jar. Good idea. Maybe it would be a good idea to try several types of oil. There's some type of "di-electric" oil some one remarked on before, and then the WD40 stuff. How about regular 3-in-1 oil? Or maybe any light oil like 5 weight motor oil. A little bit leaked out isn't going to pollute anything.