Some vegetable oil oxidizes much faster than some other. Sunflower oil oxidizes rather quickly, olive oil I haven't noticed oxidizing yet.
My experience at low temperatures is that the difference is much bigger than in that test. A thin layer of sunflower oil takes a week or two to turn into hard to remove sticky goo, olive oil... basically doesn't seem to do that at all.
I started using it because I ran out if cutting fluid, and noticed no difference.
(It seems like I'm always being told to use this oil, or cleaner, when I'm working on a project. Before paying for the brand name, I always look up the MSDS on the product. Many products can be made at home with experimenting.)