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How To Winterize a Boat - Mercruiser 3.0 5.7 4.3 4.0 - EASY
Winterizing your Mercruiser 3.0. Winterize your lower end and motor. You could do this on a 5.7, 4.3, 4.0, and of course a 3.0 Mercury boat. Make sure you drain all the water out.
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