Tamiya RC Silicone Diff Oil #1000000 Replacement Parts Car and Truck Turnbuckles and Rods Innovative detachable prop assembly reduces Innovative detachable prop assembly reduces broken props and bent motor shafts Please note that red white zebra zone stickers and start line sticker are included in the Curve Section Set (sold separately) This is high viscosity silicone oil for use with sealed gear differential units to allow fine diff hardness adjustment to match driving conditions The #1000000 is the highest viscosity among gear diff oils currently available on the market and provides the same effect as a direct coupling spool often used in Touring Car Racing