Definitely not snake oil! Serious engineering, but significant mods to the
cooling system are needed to take full advantage of the possibilities. I looked
at this when I was studying the possibility of running the TDi engine at about
30 degrees hotter than the stock design. Concluded the additional thermal
efficiency wasn't a good enough response for the engineering investment. The
Evans approach is an excellent solution to cavitation problems and localized
overheating points. Haven't looked at waterboxer seal compatibility of thermal
stresses.

Frank Grunthaner