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Old 01-05-2014, 12:31 PM
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DoubleO7 DoubleO7 is offline
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Location: Crystal River, FL
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Kat's makes immersion/bayonet screw in heaters you could install into a NPT oil drain hole too. They advise 10 watts per quart sizing.

You might also be able to use a wrap around battery blanket (12V) or a stick on battery heater also.
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