Honda EU26i Owner's Manual page 15

Open the oil maintenance cover.
Remove the oil filler cap, and wipe the dipstick with a clean rag. Check
the oil level by inserting the dipstick in the filler hole without screwing
it in.
If the oil level is below the end of the dipstick, refill with recommended
oil up to the top of the oil filler neck.
Running the engine with insufficient oil can cause serious engine
damage.
The Oil Alert System will automatically stop the engine before the oil
level falls below the safe limit. However, to avoid the inconvenience of
an unexpected shutdown, it is still advisable to visually inspect the oil
level regularly.
OIL FILLER CAP
OIL MAINTENANCE
COVER
14
DIP STICK
OIL FILLER HOLE
UPPER LEVEL
OIL FILLER CAP