[scottj]

There is a manufacturer of piston aircraft engines that was recommending Evan's. It was known in the industry that 2 models of their engines have cooling capacity issues. They required that Evans be used in applications where CHT and coolant exit temp exceded 248 deg. F. It was a "bandaid" fix to prevent boil-over and crashing. The FAA, as well as most country's agencys, have since issued Airworthiness Directives prohibiting the use of Evans due to the liquid's flammable nature.
Note: I have no personal experience with Evans... I just thought that was interesting...