Honda CRF230F 2019 Manual page 168

If you notice any undesirable operating
symptoms, try another service station or switch
to another brand of gasoline.
Fuel system damage or performance problems
resulting from the use of an oxygenated fuel
containing more than the percentages of
oxygenates mentioned above are not covered
under warranty.
Oxygenated fuels can damage paint and plastic.
Be careful not to spill fuel when filling the fuel
tank. Wipe up any spills immediately.
Oxygenated Fuels
NOTICE
Oxygenated fuels can damage paint and
plastic. Damage caused by spilled fuel is not
covered under warranty.
Technical Information
161