[HELP] Coolant for the home hobbiest

[arvidj]

I am getting a lathe and have a mill that have coolant systems. In John's videos I often see him using coolant on his lathe and it looks like a good thing. While looking thru the Enco pages for a suitable coolant I was overwhelmed so an education is in order.

Anyone have any links or suggestions that would provide guidance or an education related to coolant, soluble cutting oils, cutting oils, etc. ... i.e. things I might put in the coolant system?

Something that does not take a lot of care and maintenance would be best as adding a skimmer or other items to control the growth of small organisms is not viable for a home system.

Thanks,
Arvid