I bought my 05' Shadow spirit with 5000 miles on it. I put on another 500ish miles over the summer. The person I bought it from had done an oil change before the winter of 2018 and did not ride it much before selling to me. Since the oil is not brand new at this point should I do an oil change before storing for winter (about 4 months left here in NJ)? Or is it ok to leave the oil in the bike over the winter and then just do the oil change before riding season starts in spring?