2004-2006 Honda FourTrax Rancher TRX350TE/TM/FE/FM Service Manual, Page 72Get this manual
MAINTENANCE If the oi leve is near or be low the lowe leve mark, remove the oi filler cap and add the recommended engine il the upper level ark
RECOMMENDED ENGINE OIL: Pro Honda GN4 or HP4 (without molybdenum additives) 4-stroke oil or equivalent ot or oil API service classjficationSG or higher JASO 903 standard: MA Viscosity: SAE 10W-40