Shell Mysella S3 S 40
Medium Ash Gas Engine Oil
Shell Mysella S3 S is a high performance quality oil blended for use in 4-stroke, spark-ignition engines which require a ‘medium ash’ oil or use sour gases such as landfill, bio or sewage gas as fuel.
Shell Mysella S3 S is also suitable for engines that traditionally require a medium ash oil to protect the valve seating area of the cylinder head.
Shell Mysella S3 S satisfies the new generation of stationary gas engines designed to meet the emerging legislation limiting emissions of NOx, and those which employ the latest ‘lean’ or ‘clean’ burn technology.
Performance, Features & Benefits
- Extended oil life
Significantly prolongs oil life by resisting oxidation and nitration, the high level of TBN (total base number) neutralizes acids and provides corrosion protection, even when “sour” gases are in use.
- Engine protection
Shell Mysella S3 S is formulated with an optimized level of ‘ash’ components which helps prolong the life of valves in engines which prefer a medium ash oil. With a maximum phosphorus content of 300 ppm Shell Mysella S3 S is compatible with engines equipped with emission catalysts.
Main Applications
- Spark-ignited gas engines fuelled by natural gas requiring a medium ash oil
- Ideal for engines fuelled by sour gases
- “Dual-fuel” gas engines ignited by diesel pilot fuel
Shell Mysella S3 S is suitable in engine types where a “medium ash” oil is required.
Shell Mysella S3 S is approved by:
- INNIO Jenbacher: Series 2, 3 Fuel Class B and C
- MAN: 3271-4
- Rolls Royce: KG-1, KG-2, KG-3 (Bio Gas Operation)
- Waukesha: Cogen Application (Pipeline Quality Natural Gas)
Shell Mysella S3 S Meets the requirement of:
- MAN: Ruston Engines (Natural Gas, Landfill/Digester gas/Biogas). Dual Fuel (Pilot Diesel)
- Wartsila: CR26
For engines under warranty, Shell advises contact with the engine manufacturer and Shell representative to choose the appropriate oil given the equipment operating conditions and customer maintenance practices.


