Toyota 2015 Hilux Owner's Manual page 530

530
8-2. Steps to take in an emergency
The coolant level is satisfactory if it is between the "F" and "L" lines
4
on the reservoir.
Reservoir
1
"F" line
2
"L" line
3
Radiator cap (if equipped)
4
Gasoline engine
Add engine coolant if necessary. (→P. 552)
5
Water can be used in an emergency if engine coolant is unavailable.
Gasoline engine
Diesel engine
Diesel engine