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Slow speed, stop-and-go operation means that the engine seldom gets hot enough to drive the water and vapor out of the crankcase.

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Excessive friction in the engine, however, would mean rapid destruction.

In order to reduce the formation of rust, commercial antifreeze contains an inhibitor designed to prevent corrosion.

This improves cooling efficiency and prevents evaporation of the coolant.

By lubrication, reduce friction between moving parts of engine.