Supra SL Owner's Manual page 76

NOTE: During the winter months, water is a boat's
worst enemy. Always store the boat when the interior is
completely dry. Periodically check on the condition of the
stored boat.
Damage due to improper winterization IS NOT covered
under your boat's warranty.
E-10 fuels require fuel stabilizers that are specifically
designed for E-10 fuels to help prevent moisture
absorbtion, phase separation and gasoline stabilization.
Summerization
Before using the boat after it has been in dry storage requires
some special treatment. Supra recommends having your boat
professionally summerized, preferably by the same facility that
prepped it for storage. They will be familiar with what items
were done in the fall and what items need to be addressed
in the spring.
In addition to having your boat professionally summerized, the
following list of tasks should be done to ensure a successful
start to your boating season.
©2017 Skier's Choice, Inc.
Check Trailer
Tire Pressure
Lights
Charge Battery
Clean & Wax Gel Coat
Clean Interior
Check All Systems
Blower
Bilge Pump
Navigation Lights
Interior Lights
When launching the boat for the first time of the season,
carefully watch all gauges to ensure that the boat is not
overheating, the alternator is charging and the engine has
proper oil pressure.
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