Besides keeping written records, I've started taking pictures also. Something i stumbled onto is the polaris ride command app for iPhone has a spot for maintenance. where you can utilize the app and save your records in the polaris app.Keeping your warranty intact is pretty important, at least to me.
My dealer told me if I was doing my own oil changes...just keep the receipt and note the total engine hours when it was done.
So....I'm sticking with the Polaris oil change kits.
Just sayin'
Pirate