This summer I've used the gear diff on astro as it just seems to make the car so much more balanced and easy to drive than the ball diff. If it rains I usually put the ball diff in to be safe and also on grass. Although I do want to try the gear diff on grass and in the lower grip and try some thinner oils.
So far I have only used 3k oil which seems quite standard. If it's a really high grip and twisty track the 5k oil might be needed but iv yet to need that. Also if you are in a lower grip track you could try 1k.
I'd start with 3k and see how you get on but I wouldn't think you'd ever need to go above 5k.
What sort of tracks do you run on?
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