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IMPORTANT: Mercury MerCruiser recommends that propylene
glycol (a nontoxic and environmentally safe) antifreeze be used
in the seawater section of the cooling system for cold weather
or extended storage. Make sure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use
in marine engines. Be certain to follow the propylene glycol
manufacturer’s recommendations.
9 For additional assurance against freezing and rust, fill the cooling
system with a mixture of antifreeze and tap water mixed to
manufacturer’s recommendation to protect engine to the lowest
temperature to which it will be exposed during cold weather or
extended storage.
A Remove thermostat housing or hose and fill with coolant until
block and head are full. If thermostat housing was removed, re-
install and tighten cover bolts securely.
B Remove water hose from exhaust manifold and fill manifold
with coolant. Reinstall hose and tighten clamp securely.
Store boat with drive unit in full DOWN/IN position.
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