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Sirius X 40

Super High Performance Diesel Engine Oil

Shell Sirius X is a top quality lubricant, of the Super High Performance Diesel Engine Oil (SHPDO) class. It is designed for the highest output, high-speed diesel engines, burning distillate fuel and is formulated to give better engine protection and longer drain intervals than normal diesel engine oils. Shell Sirius X is especially suitable for the high power/weight units used in fast vessels and compact generator sets.


  • High-speed diesel engines operating on distillate fuels.
  • N.B. Not suitable for N. American automotive type engines, for which API CF-4 type oils are required.

Performance Features

Outstanding piston cleanliness

Free-running piston rings, even under difficult operational conditions, ensuring maximum reliability.

Exceptional protection against bore polishing

Control of blow-by and oil consumption, preserving engine efficiency. SHPDO type oils are preferred by many engine manufacturers to guard against bore polishing.

Exceptional engine cleanliness

Ability to retain high levels of soot safely in suspension, even with extended drain intervals.

Oxidation resistance twice that of conventional oils

Ability to withstand high temperatures for longer, in severe service or with extended drain intervals.

High reserve alkalinity

A TBN-E (total base number) of 17 to neutralise acids and provide corrosion protection until the next drain interval, even with the higher sulphur levels sometimes found in marine distillate fuels.

Performance Specifications

API       CF

Approvals and Recommendations

Shell Sirius X is approved by:

  • MTU (Type II high performance category)
  • CWEC (Cummins Wärtsilä Engine Company)
  • MWM Deutz (high output, high speed, e.g. TBD 620)

and meets the requirements of:

  • Caterpillar 3600 Series


Advice on applications not covered in this leaflet may be obtained from your Shell Representative

Health & Safety

Shell Sirius X is unlikely to present any significant health or safety hazard when properly used in the recommended application, and good standards of industrial and personal hygiene are maintained.

Avoid contact with skin. Use impervious gloves with used oil. After skin contact, wash immediately with soap and water.

For further guidance on Product Health & Safety refer to the appropriate Shell Product Safety Data Sheet.

Protect the environment

Take used oil to an authorised collection point. Do not discharge into drains, soil or water.

Typical Physical Characteristics

Shell Sirius X 30 40
SAE Viscosity Grade 30 40
Kinematic Viscosity
40°C, cSt
100°C, cSt
Density 15°C, kg/l 0,885 0,890
Flash Point, Closed Cup, °C 218 230
Pour Point, °C -18 -18
TBN-E, mg KOH/g 17 17
Sulphated Ash, % wt 1,85 1,85

These characteristics are typical of current production. While future production will conform to Shell’s specification, variations in these characteristics may occur