This was my first season with my new 24" Ariens. From what I read, I was supposed to use it for between 3 and 5 hours for break in and then drain the oil. I planned on doing that and replacing the original oil with synthetic. Problem is, with only one significant snow fall this year, I used the blower for only about 2 hours. Should I treat this as I would the break in or should I replace with regular oil for the off season, run for another hour or two to finish the break in next year and then switch to synthetic?