Is coolant so expensive?
Nope , the heat transfer is better with least AF .
AF has only 5/8 the heat carrying ability of just water.
Most ancient trawler engines have very low pressure caps , so a higher temp of a pressurized car or truck setup does not work.
With the right cap, a coolant recovery system will work, but fill tanks are above the engine so this does not make cooling more efficient .
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