Honda TRX250TE 2019 Owner's Manual page 126

Engine Oil
5. If required, add the specified oil into the fill cap hole, up to the
upper level mark on the oil fill cap/dipstick. Do not overfill.
6. Reinstall the oil fill cap/dipstick.
NOTICE
Running the engine with an improper oil level can cause serious
engine damage.
LEFT SIDE
(1)
(1) oil fill cap/dipstick
116 Servicing Your Honda
(2)
(3)
(2) upper level mark
(3) lower level mark