Just wondering if I could use propylene glycol,(non toxic ant-freeze)as a coolant for machining and grinding.At one time I could buy water soluble oil locally.I really liked it.It never discolored or rusted my machine.I went to the local bulk plant Monday and they looked at me like I was from another planet when I asked for water soluble oil.Finally the guy looked it up and found they sell Mobilmet S-122 but,they had none in stock and there would be a 3-4 week lead time.Just looking for an alternative that I can obtain locally.Any advice would be nice.