In a perfect world, you'd do a nice full oil and filter change just before you lay her up, so the engine is left sitting with fresh, clean lube inside for the winter. But unless your oil is really old and nasty, it's unlikely to cause any massive harm if you don't bother and spend the time drinking cheap sherry instead.
What will cause trouble is frozen coolant. We covered anti-freeze checks and changes last week, so if in doubt, get the anti-freeze changed out for fresh stuff.
We could fill the entire Visordown website with myths, rumours and legends about what to do with your fuel tank over winter. Lots of folk seem to think that petrol will turn into some sort of motorcycle kryptonite if you leave it in the tank for more than a fortnight, destroying your fuel system from the inside out thanks to green Nazis putting ethanol in, or something. Okay – letting fuel evaporate inside old dirty carburettors might not be the best plan. But for most people, for a four-month spell in the garage, on a fuel injected bike, there's not too much to worry about. Top the tank up, so there's nowhere for rust to start, and you'll be fine.