Yes you can, Polaris only recomends that you use Polaris brand oils, but any oil of the same weigth should work just fine.
The Polaris dealer would be the obvious choice.
You should use Polaris ps-4 synthetic oil for year round use. l
Two quarts
Polaris has their own special "fork oil". 7.5 weight is equivalent to polaris oil or use a 10 weight to improve dampening.
9 OZ.
0W-40
Yes, as long as you use the correct SAE weight oil. Polaris oil is regular oil.
intial 10 hrs and every 50 hours of use
0-40w.
1.2 to 1.5 quarts of 0w30 synthetic. strongly recommend using real polaris oil.
you don't change your oil on your sled, it's oil injected and 2 stroke, It uses the oil...just keep your tank full