Personally I would do an oil change. It's cheap insurance to know for sure there is no acid or moisture buildup, or fuel contamination. Why take the risk with your new car just to save a few dollars? $50ish to change the oil is reasonable for a $40-60k car.Somewhere I heard that with newer synthetic oils there is no need for fresh oil before a long term (6 month) storage. Less acid damage or something. True? I only have 1100 miles on the Mustang and it's time to pack it away.