Wow, I did not see this coming: rancid coolant and damage to the machine.
I will skip it for now, and just leave the flood coolant system empty.
Since I don’t go out of state for school anymore, I will be staying home for 6 weeks a year just working in my shop. I will probably put coolant in the system for those 6 weeks and leave the system empty the rest of the year (when I can only work on the lathe on weekends).
How long does it take before the coolant mix becomes rancid?