Join Date: Feb 2010
Location: Narragansett Bay
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Re: Topping Off Fuel for Winter
Some marinas sell ValvTect marine fuel, which has stabilizers and biocides already added. (so we're told). Both are pretty important if you're leaving fuel in the tank over the winter.
Otherwise, I've never heard that road fuel would be bad for a marine motor. It is just taxed differently, which is the primary reason for the color difference. Most buy diesel conditioner and biocides to add anyway, so I don't think it matters to your motor, if you do too.
On the other hand, I've always felt that paying a few more bucks for fuel at the marina is helping keep docks, water, power, parking lots, launch ramps, etc around for us. They don't just exist.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.