HONDA TRX420TE/FE - Manual (Page 114)

SE, SF or SG API classification
viscosity (weight)
suggested oil
Honda 4-stroke oil or an equivalent
SAE 10W-40
NOT RECOMMENDED OK
106
Oil Recommendation
Engine Oil & Filter
Servicing Your Honda
Motor oils intended for Service SE, SF or SG will show this
designation on the container.
Your ATV does not need oil additives. Use the recommended oil.
Do not use oils with graphite or molybdenum additives. They may
adversely affect clutch operation.
Do not use API SH or higher oils displaying a circular API ‘‘energy
conserving’’ service label on the container. They may affect
lubrication and clutch performance.
Do not use non-detergent, vegetable, or castor based racing oils.
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