Castrol RLX Super 40 is a 5th Generation (LMOA) zinc and chlorine free engine crankcase lubricant which has been specifically designed for the lubrication of diesel propulsion, diesel electric and stationary power generation installations where a zinc-free lubricant is specified. Castrol RLX Super 40 is formulated to meet the requirements of engines manufactured by General Motors Electromotive Division (GM-EMD), General Electric (GE) and ALCO. This grade is suitable for all engines fitted with silver bearings, particularly those used in Marine and Offshore power generation sets.