Antifreeze

Evan's orginal version is/was very viscous at ambient temperatures. You'ld still want a block heater in cold climates. The main advantages were that a) potentially higher compression could be implemented without pre-ignition b) propylene glycol based so less hazardoes c) was supposed to be equally effective without using pressure to raise the boiling point. Disadvantages were the viscosity, cost, need to keep moisture out of the system. It was a huge PIA if needed to refill or even top off and you didn't have extra with you. Now they offer several different versions but I've lost interest in their products for my own use.