Traxxas 5130 Differential Oil, 100,000 WeightOil, differential (100,000 weight) (. 7 oz (20cc))Traxxas performance diff lubes make it easy to increase or decrease the limited slip action of the gear differential. Depending on the track conditions, altering the limited slip capability can enhance turning performance for faster exit speeds. Each diff lube weight can be purchased separately as well. Use Traxxas stock and hop up replacement parts to get the most out of your Traxxas RTR vehicles.