This is the Factory Team 4000cst Diff Fluid from Team Associated. This can be used in any application that requires diff fluid.
Factory Team Silicone Fluids are made of the highest quality materials and are laboratory-tested, resulting in a high-performance blend of premium silicone that provides more consistent differential action as well as longevity.
Features:
New flip-top cap
Sticker on lid to quickly find the fluid you are looking for
These new fluids allow for finer tuning, providing more options than before
Factory Team Silicone Fluids are made in the USA exclusively for Team Associated by Lucas Oil Products, Inc. for consistent viscosity