Just to clarify. Water Wetter reduces the surface tension of the coolant which helps to dissapate heat from around the cylinders. These temps will not normally show on the guage. The temp you see on the guage is an average. The temps around the cylinders is a lot hotter and this is what you want to keep cool. Heat and poor lubrication are engine killers.

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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel