Oil doesn't break down over time in storage, but condensation does accumulate. You can change your oil in the spring to get rid of that little bit of water, or you can drive it to boil it off. Personally, I wouldn't bother with changing it. The reason to change oil is if and when acids and combustion byproducts accumulate, or if the additives break down from shear. That's a function of use, not time.
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