2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 72Get this manual
MAINTENANCE The engine contains sufficient amount of oil if theITUAFR FFI oil level is between the upper and lower levelmarks on the dipstickIf the oil level is near or below the lower level mark, add the recommended engine oil to the upper level markRECOMMENDED ENGINE OIL: Pro Honda GN4 or HP4 (without molybdenum additives) 4-stroke oil or equivalent motor oil API service classification: SG or higher JASO 903 standard: MA Viscosity: SAE 10W-40 NOTE: Other viscosities shown in the chart may be used when the average temperature in your riding area is within the indicated rangeReinstall the oil filler capdipstickInstall the left side cover (page 3-5)
OIL VISCOSITIES