Honda 2008 Odyssey Owner's Manual page 432

Automatic Transmission Fluid
5. If the level is below the lower
mark, add fluid into the dipstick
tube to bring it to the level
between the upper and lower
marks on the dipstick.
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Pour the fluid slowly and carefully so
you do not spill any. Clean up any
spill immediately; it could damage
components in the engine
compartment.
Always use Honda ATF-Z1
(automatic transmission fluid).
Use only Honda Genuine ATF-Z1
(Automatic Transmission Fluid). Do
not mix with other transmission f luids.
Using transmission f luid other than
Honda Genuine ATF-Z1 may cause
deterioration in transmission operation
and durability, and could result in
damage to the transmission.
Damage resulting f rom the use of
transmission f luid other than Honda
Genuine ATF-Z1 is not covered by the
Honda new vehicle warranty.
6. Insert the dipstick all the way back
into the transmission securely as
shown in the illustration.
Make sure the rubber cap on the
dipstick fits in the dipstick guide
and that you push the dipstick in
all the way.
The transmission should be drained
and refilled with new fluid when this
service is indicated on a maintenance
message on the information display
or on the multi-information display
(depending on models).
If you are not sure how to add fluid,
contact your dealer.