My DH is also a car person, former auto body and mechanic. He still maintains our vehicles. He says every vehicle that can move should be operated at least an hour a week and get the fluids circulating. Also never let the vehicle get bottom dry low on gas because sediment especially from old tanks will ruin the engine. he has said that is the way to keep good maintenance on any machine. Sewing machine's included. We only recently found out his grandfather worked in a textile factory and helped maintain sewing machines.