Click to expand Tap to zoom Silicone Diff Oil 7000 (a) by Mugen – B0323a Sold out £8.69 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out The thicker the oil, the less your differential will "diff out" in the corners, where the two tires will turn at different speeds. Changing the diff oil in your diffs is one of the most important tuning options for off-road buggies.