2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 127Get this manual
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LUBRICATION SYSTEM
STANDARD
SERVICE LIMIT
2.8 liters (3.0 US qt, 2.51mp qt 3.1 liters (3.3 US qt2.71mp qt) Recommended engine oil Pro Honda GN4 4-stroke oil (U.S.Aand C