2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 60Get this manual
ENGINE (300) 25Support the engine and remove the (9) bolts retaining the transmission to the engine26Remove the engine from the assembly to perform engine service
Engine Lubrication
Oil Type: Polaris PS-4 Plus 2W-50 Synthetic Capacity (DRY): 1.641.95 U.SQuarts (1.551.85 l) Capacity (OILFILTERCOOLING BLOCK CHANGE): 1.41.7 U.SQuarts (1.31.6 l) Drain Plug:14-18 ftlbs(19-24.4 Nm) Oil Pressure Specification: Any pressure reading above PSI (using Polaris PS-4 2W-50 Synthetic, while at operating temperature and idle speed)
Oil FlowPressure Test WARNING
IMPORTANT: DO NOT LIFT STARTING CLUTCH SHAFT! ENGINE BY THE Oil temperature can cause serious injury and damageWear the proper safety gear when performing these proceduresNOTE: Due to the engine assembly having majority of roller bearings, oil pressure readings hot or cold will be very lowLow oil pressure is not an indication of oil delivery problem123Remove plug from the crankcaseInsert 14 Pipe Thread oil pressure gauge adaptor into the crankcase and attach an oil pressure gaugeStart engine and allow it to reach operating temperature while monitoring gauge indicatorAny pressure above PSI is an indication of good oil flow