Honda Civic 2017 Owner's Manual page 561

uuMaintenance Schedule
If you drive your vehicle under severe conditions, you must have the following items
served to the maintenance schedule indicated as Severe.
Items
Transmission fluid
* Not available on all models
560
* u
1Maintenance Schedule
Condition
B, D
*
The condition is considered as severe when you drive:
B. In extremely hot temperature above 35°C.
D. With a trailer towing * , or loaded roof rack, or in
mountains.