I run antifreeze in my engine. It works better when its cold and the glycol is actually a really good lubricant. The engine runs way cooler in the summer too. It is too slippery for the clutch though so in the primary Ive found brake fluid works the best.
Are they endangered or something? Well fine... If you wanna spend a little more money the synthetic cheetahs blood (mobil 1 v-twin) works pretty damn well for me.