hellcamino,

If you look at DangerDen's web site, they also sell a small/tiny bottle of Zerex Proplyene Glycol aka "Zerex Super Racing" for almost $4 a tiny plastic bottle. I think I can source a whole gallon of that stuff for about $10

Valvoline Zerex Super Racing is pink, and I really don't know how Hydrx got to be green, but I think Hydrx is still Proplyene Glycol.

Pentosin is Ethylene Glycol, and is toxic as can be. I'm sure you knowthat Proplyene Glycol is used in Nascar (and almost all GT car racing) because its a whole lot safer to the driver when it leaks out.