Hi, I'm new to this malarky so please excuse my ignorance. I recently boat my first Rib, an Avon 5.6D, it has a Mercury 90 ELPT (2004). The boat is undercover for the winter in a sheltered but open fronted barn with the engine wrapped in an old Duvet! I intend to use it given an opportunity and intend to be running the engine up at least once a month just to 'flush it through' and to keep the battery good. The boat has a fixed on-board fuel tank which is less than a quarter full and it is vented.
Given the above conditions would it still need to be winterised? Fuel additive and fogging oil etc.
Thanks in advance for more experienced 'boaters' opinions and advice