I live in Michigan and keep the car in a storage unit during the winter (the wife gets the garage). The unit has no power or heat. I put it up around October and bring it home around April (depends on weather and work schedule). I drive maybe 1,000 miles a year if that. I change the oil right before putting it up to flush all the stuff out since it will be sitting all winter without starting it up. Then in spring I change it again so it has fresh oil for summer. It may be a waste of oil, but makes me feel better about it. I stock up on Valvoline VR-1 when it's on sale. I have thought about using conventional during storage, but not saving much money when I get the VR-1 on sale.