2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 133Get this manual
6-6 ENGINE LUBRICATION SYSTEM Engine Oil and Oil Filter WARNING
Vehicle operation with insufficient, deteriorated, or contaminated engine oil will cause accelerated wear and may result in engine seizure, accident, and injury
Oil Level Inspection
If the vehicle has just been used, wait several minutes