[urq] water wetter.

[Paul Lethbridge]

Another perspective is to consider is that the temperature gauge is
measuring the temperature of the water surrounding the sender (a NTC or
PTC resistor encased in brass/copper) not the engine...
 
If an additive to the water actually decreased the efficiency with which
heat is transferred from engine components to the water, then the water
temperature would be lower and your gauge would also show a drop in
temperature. You would thud be duped into thinking that you are running
at a lower temperature...meanwhile your "engine" is actually running a
lot hotter!
 
Food for though..... 
 
Kind regards,
 
Paul.