Put some Sta-bil in the fuel. I keep about 1/4 tank in it. Another thing is cover the exhaust tip with tape or stick a wad of steel wool in it. This will keep little rodents from making a winter residence.
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99 Boxster sold
88 944S sold
Xpit Formula Four sold
95 Integra Solo I sold
71 Opel GT sold
The factory recommended procedure is to completely fill the tank for storage in order to minimize condensation. Why do you feel that 1/4 tank is the way to go?