Ima try some V4M sometime. In my over 1 year career I only bought one bottle, spilled 3/4 of it, and still haven’t used it all.
Amazing…
YYJ Thin is -not- synthetic. It’s a variant of an olive-based oil. 100% natural, non-toxic, non-reactive, etc. Heck you can even safely eat it… though it tastes -horrible- so I don’t recommend it 
Dale wanted something that was both safe for the plastics in yoyos (many oils aren’t) and safe for kids.
Kyle
Haha! Didn’t even look at the volume. 1 ounce will last me for a decade.