I've looked out my old sewing machine that hasn't been used in decades. I've given it a good clean and want to oil it but I don't have sewing machine oil. I've read that I shouldn't use WD40, I can't find the can of 3 in 1 oil that I thought I had but I did find a can of AC90 oil.
What is the worst that can happen if I spray a little AC90?