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Wear Protection

Shell Strombus MP's unique combination of base oils and carefully selected additives, give good emulsibility whilst offering a high level of protection to the metal surfaces, in the presence of water.

System Efficiency

Shell Strombus MP absorbs high amounts of seawater. There is no need to reduce the concentration of seawater emulsified in the oil until it reaches levels of over 20%.

Minimising risks of water ingress : Water is absorbed to form a stable emulsion which continues to offer good lubrication and protection against corrosion. The oil and its emulsion are sufficiently fluid to circulate around the stern tube bearing oil system.

Shell Naturelle S4 Stern Tube Fluid 100

stern tube


Shell Naturelle S4 Stern Tube Fluid 100 is a non-emulsifying synthetic fluid specifically developed for use in stern tubes. Manufactured from fully saturated esters, Shell Naturelle S4 Stern Tube Fluid 100 is designed to offer superior lubrication performance while also being readily biodegradable and having low ecotoxicity.

Designed to offer superior lubrication performance

Fully saturated esters ensure excellent resistance to oxidation and hydrolysis while offering high-temperature thermal stability.

Excellent hydrolytic stability

A non-emulsifying fluid with excellent water separation and anti-foaming characteristics that helps to maintain equipment performance.

Environmentally considerate

  • EU Eco Labelled
  • Independently certified as VGP compliant

Increased wear protection

Ashless (zinc-free) additives provide protection over a wide range of conditions.

Approvals from leading stern tube and seal manufacturers include*

  • SKF Blohm + Voss Industries
  • Wärtsilä Propulsion
  • Kemel
  • Aegir-Marine

Shell Strombus

Shell Strombus has been formulated to help protect your stern tube components from corrosion and wear.


Product Description Viscosity,
mm2/s AT
kg/m3 at
    40°C | 100°C        
Shell Strombus MP Emulsifiable stern tube oil 273 | - - 200 -5 900

Optimise Your Operations with Technical Services

  • Lubricant advice can help you to select the right lubricant grade to deal with the specific level of oil stress in your engine.
  • Shell Rapid Lubricants Analysis  is an oil condition monitoring service that helps your vessels to run smoothly by identifying potential oil or equipment failures before they become critical.