Comment by legitster

WD-40 classic does not contain PFAS. Which is not to say you should breath it in.

> Canola oil works super well in practice without any of these risks.

I cannot advise enough against using canola oil for most lubrication purposes. It's biodegradable and will break down (good for some applications) but for the most part oil breaking down is a bad thing if you want to keep something well maintained. It would gum up over time, start reacting chemically with dust or other chemicals, and potentially even cause damage. Especially if you lubricate to prevent rust.

Also, in the context of breaking loose bolts, oil alone doesn't have any capacity to break up or penetrate rust.