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.

Approval Status

  • API CF / CF-2
  • Conforms to the requirements of `Generation 5` for GM-EMD and `Generation 4LL` for GE.
  • Meets the oil recommendations for Caterpillar 3600 series engines. Suitable for all ALCO engines.

Technical Data

Name Method Units RLX Super 40
Density @ 15°C ASTM D1298 g/ml 0.890
Kinematic Viscosity @ 100°C ASTM D445 mm²/s 14.5
Viscosity Index ASTM D2270   100
SAE Number     40
Total Base Number, TBN ASTM D2896 mg KOH/g 13.7
Pour Point ASTM D97 °C -15
Flash Point (PMC) ASTM D92 °C >200
Sulphated Ash ASTM D874 % m 1.5
Zinc Content   ppm <10
Chlorine Content   ppm <10

The above figures are typical of those obtained with normal production tolerance and do not constitute a specification.

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