I've been using Castrol Cooledge 6519 semi synthetic coolant in my home shop for about 2 years. Seems to work pretty well, but I guess the best thing is that it never seems to generate any odor and the machines stay very clean. Finally used up the last of it today, and looked on MSC and see that it is now $250/5gal. I've been using at around 10% which is a little rich, but I don't want rust when the machines sits all week unused. Anyone use this stuff down around 5% without rust on ways etc.? Anybody know who sells it by the gallon? Castrol was no help. MSC shows gallon jugs of 6519 in their catalog, but only sell in
5 gallon pails. Open to other suggestions for coolant, but must have minimun odor problems in small sumps - I have an office/guestroom area over the shop.- posted
17 years ago