Center diff and diff lubes

[Matthew_Armeni]

Ussually it's heaviest in the middle, 2nd heaviest in the front, and lightest in the rear. So if those are the oils you have it'd be 10k middle, 7k front, and 5k rear. Although 5k in the back and 7k in the front are fairly heavy for a buggy. I wouldn't go heavier than that, maybe try 5k in the front and 3k in the back like others have suggested. Good luck!

[Power Adder]

O my bad so lighter oil in back gives me less oversteer and heiver oil means more understeer

[tom255]

O my bad so lighter oil in back gives me less oversteer and heiver oil means more understeer

Not exactly ONPOWER and OFFPOWER factor here also
With hevier oil back Onpower it oversteer (your buggy tends to loose your back starts to slide) Offpower it understeer (you feel that your buggy not steer well like it supposed to)
Some basics you will find here also http://users.pandora.be/elvo/ its for onroad car but basics are same