How to Winterize the Mercury Mercrusier 8.1L 496 Mag Marine Engine

The Mercury Mercrusier 8.1L 496 Mag marine engine was designed with winterization in mind. The engine is equipped with a Closed Cooling system as well as a drain system. Many people assume that the closed cooling system eliminated the need to winterize the engine however as you will see in this video, complete winterization covers much more than simply draining the engine to prevent freeze damage.