25 hour/400 km service on a 2021 Polaris Sportsman 570Polaris PS4 oil change kit part # 2877473 1.9 Litres / 2 qt. RequiredPolaris Demand Drive Fluid for front differential part # 2877922 265 ml/9 oz required Polaris AGL full synthetic for transmission part # 2878068 948 ml/ 32 oz required.