If you are using a good-quality oil*, change it at 20000-30000 mile (30000-50000 km) intervals and you should be OK. It's not like the oil is good one day and bad the next, so putting a few extra miles/km on the oil is not a big deal (assuming the oil is still in decent shape, which it should be with 50km on it).
Personally, I'd change the oil before putting in storage. The oil collects acids and other contaminants that I wouldn't want sitting in the engine over the Winter. YMMV
*Many threads on this. In a nutshell, most modern oils are good enough for DD use.
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