I have a 2004 1/2 700 Sportsman. I bought it when it had 100 miles on it. It only has 715 now. I just did an oil change using Amsoil ATV 0W-40. I've never changed the differential or transmission fluid. Would you guys recommend also using Amsoil products for these or are the Polaris fluids decent enough.
Any input is appreciated.
Thanks.

 

On the transmission I would stay with Polaris AGL or if you can find an equivalent oil for chain driven gear cases and you'd rather use this then it should be ok. For the rear differential any 80/90 GL5 is ok. The front differential I would use Polaris Demand Drive fluid only! Just my OPT

 

X2 on the front diff fluid. Heard a lot of others using other stuff in the motor/tranny/rear diff but anything other than demand drive on the front will give you issues.