2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 131Get this manual
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6-4 ENGINE LUBRICATION SYSTEM Specifications
API SF or SG API SH or SJ with JASO MA SAE10W-40 1.1 (1.16 US qt) (when filter is not removed) 1.3 (1.37 US qt) (when filter is removed) Between and