Transfer & Diff Oils

Hi, Just a quick one:

im going to change my gearbox, transfer and diff oils.

Going for the Difflock Evo oils.

I will get 3 ltrs of the EVo 1 for gearbox.

I have added up and i think i require 4.7l of the Evo 2 for Transfer & Diffs.

Does everyone reckon 5ltrs is enough or should i go for 6, to ensure im not left with one diff not filled properly.

Never done a change before, so just looking for peoples opinions really.

Cheers

You might want to think about checking your swivel housing oil levels.