Hey all. Kind of new here. I have two okuma genos L- 250's. Running the same coolant in both. Mix's are good and the same in both. One machine is fine, the other foams. Foaming fairly good. What would cause one machine to foam and the other is fine? Don't know if it makes a difference, one machine runs only steel and the machine that foams runs only copper. This foam has been there on and off, but lately foaming a lot more and not going away.