It is better to change your lube oils before a long term layup, such as during winterization. This is the ideal time because you are removing the combustion byproducts and acidic buildup from normal operation of an internal combustion engine. Changing the gear Lube is also recommended for long term storage. The goal is to have fresh fluids protecting the internal components. It also provides an opportunity to identify any concerns for water intrusion or excessive wear that has taken place during the season.