I think we are all sort of brain washed into thinking we need to change oil a lot more often than we do on things that get little use
the fear of condensation and such, I would bet are pretty low
I know a bunch of guys that NEVER change oil, just add as needed and get 200k out of there vehicles motors and never have a motor issue
I think there nuts doing this, but they been doing it for 30+ yrs and no changing them LOL
the way I see it is like this
oil is still pretty cheap, this sport is NOT so cheap, and its super short
I try my best to do all I can to lower the odds of me having down time in my season(here its half of what many have , total 800 miles last yr ??)
so, for me I do a once a yr oil /filter change on my XF 7000 (yamaha motor) not cause I think I need it, just to MAYBE lower the odds of something going wrong!
its 50 bucks, and a small amount of money in the big picture of what this sport costs me each yr LOL!
but sure an extra 50 bucks in my pocket wouldn;t hurt any either!
your call , your sled!