Team Associated 5448 Silicone Diff Oil 80000 Weight is factory tested it is made of a high performance blend of premium silicone which provides great performance1x team associated bottle of oil 59ml, 2ozCompatible with most brands of RC Cars 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 differential oil in your diffs is one of the most important tuning options for off-road vehicles.