G'Day Gents, I have just filled my mills coolant tank up with a light neat cutting oil, but I would really like to change it back to soluable oil. The reason I have not put soluable oil in, is because in winter it's not unusual for the workshop to go down to -5°C overnight. I know that close to 0 temp's can/will cause the solution to separate. What experience have other members had in very cold workshops? Cheers, Phill. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.