As original supplies of Monotype oil begin to dwindle, what are you using for casting? I have an open can of unidentified oil that works well (green can on the left in the picture) from a Monotype shop and an unopened can of #1 Mould Oil. I looked around for a readily available oil that has a high "smoke point" and tried avocado oil. Not good, at operating temperature it ran like water and created a mess. Castor oil? Also, I don't want to breathe engine oil or anything with unnecessary additives. What are your experiences?