I'm flattered... you didn't insert the adjective "wannabee". Ahma haveta tell the group.... :)
Indeed, soluble oil, but the output is too prodigious even for that (on a maintenance basis), so I basically pour it around the plants/lawn/house.
I tried draining it right into the Fadal resevoir tank, figgered it'd be good as "makeup water", and boy was I surprised to see the tank overflow (30-35 gal!), not to mention the coolant getting awfully thin in the meantime.
So I had to stop that, and do the 5 gal bucket thing. Somewhat the pita. Each 5 gal bucket is 40 lbs, made more difficult by pulling it from an awkward location, and then tryna not spill it, and then for some distance. sheeesh..... I think NYC water is about .00001 c per gallon.
Oh well... . But, you know what they say: 00001 penny saved is .00001 penny earned. :)