2009 Arctic Cat 150 ATV Service Manual, Page 13Get this manual
4Clean the screenfilter in parts-cleaning solvent; then inspect the O-ring and replace if damaged5Install the screenfilter, spring, and screenfilter cap into the crankcase and tighten to 11 ft-lb6Remove the oil fill plug and pour in 1.0 (1.06 U.Sqt) of the recommended oil into the fill hole; then install the oil fill plug ! CAUTION
Any oil used in place of the recommended oil could cause serious engine damageDo not use oils which contain graphite or molybdenum additivesThese oils can adversely affect clutch operationAlso, not recommended are racing, vegetable, non-detergent, and castor-based oilsKM851A
7Start the engine (while the ATV is outside on level ground) and allow it to idle for few minutes8Turn the engine off and wait approximately one minuteCheck the oil level in the engine oil inspection windowThe oil level should be visible through the windowIf oil is not visible, add recommended oil until the oil level is visible between the lines of the windowKM845A