it's nto really oil in those it's more like different weights of grease. The lighter the looser, i guess you could say, the gears, the thicker the tighter and the more of a posi locking effect it has. So I would think that using anti seave(which tends to be pretty thick) would have a locking effect. Also if I'm not mistaken the chassis doesn't have a hole in the bottom where the diff sits so the grease stays in the diff housing.