This is based on whether your trailer is assembled with bearing buddies, Sure-Lube, or Super Lube hub systems. Venture Trailers uses a Sure-Lube hub system with Castrol Pyroplex red grease. Castrol Pyroplex red grease is a high temperature EP, lithium complex grease that meets the highest performance standards of automotive (particularly Disc Brake Wheel Bearings) fleet. Formulated from selected base stock and containing unique oxidation inhibitors, this grease possesses outstanding thermal stability. Castrol Pyroplex red has excellent rust protection, mechanical stability, and compatibility with other greases.