The FRV autobox is very similar to the petrol CRV auto - if you drain the 'box 3 litres comes out but about 5 litres remains inside.
That's why Honda schedule the first "change" at 75k then every 37.5k thereafter.
I've been doing it myself every 20k (changing ~35% of the fluid each time) using Honda ATF.
Dunno if the diesel slushbox is much different.
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