Diff oils - Need help, plz look!

[Dafni]

Okay, nobody wants to give a lil' explanation....

So I bring it on bit by bit, to see if anybody can help me: At the moment my buggy runs fine, basically, but it has a massive understeer under hard acceleration. What would you change, diff-oil-wise, to prevent this?
(it has pretty light oil in f&r, and heavy oil in the center)

If anybody could give a short explanation on what oil does what to your handling, I would be gratefull.

Squee, the ofna ultra diff has 6 spyders, as you would say.

DAF