I dont know what thickness grease is in there from stock but i just stripped mine down washed out the grease with fairy washing up liquid, rinsed off and left to completely dry. Then filled the diffs with silicone oil 5k in the front, 7k in the centre, and 3k in the rear and found it made a great difference to the handling. I also fitted the front anti roll bar at the same time, whether it has made a difference or not i dont know but its so much nicer to drive now ive done those two things.