2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 54Get this manual
MAINTENANCE
ENGINE OIL LEVEL
The oil tank is located on the left side of the vehicleTo check the oil level: 1Set machine on level surface2Start and run engine for 20-30 secondsThis will return oil to its true level in the oil tankAbout cup of oil will remain in the crankcase3Stop engine, remove dipstick and wipe dry with clean cloth4Reinstall dipstick, screwing into placeNOTE: The dipstick must be screwed completely in to ensure accurate measurement
Dipstick
5Remove dipstick and check to see that the oil level is in the normal rangeAdd oil as indicated by the level on the dipstickDo not overfillNOTE: Rising oil level between checks in cool weather driving, can indicate moisture collecting in the oil reservoirIf the oil level is over the full mark, change the oil