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Then I perhaps stand corrected! I have had olive oil gum up on me during my earlier days of this, but I was using it straight, so who knows.
Still, I think machine oil or even other thinner more...

I would steer clear of Olive oil, as it has a tendency to gum up. Better would be either mineral oil (same thing baby oil is made from, but without the fragrance) or a light sewing machine oil....