Mobilgard™ M20 Series diesel engine oils

View all products in medium speed engine oils

Related product

EMF.5™ – Engineered Marine Fuels

Our new EMF.5™ range of fuels complies with the IMO’s 0.50% sulphur cap without compromising on quality and performance.

Learn more

Mobilgard™ M50 diesel engine oil

Mobilgard™ M50 extra-high-performance 50 TBN marine engine oil is designed for use in the most severe residual-fuelled, medium-speed diesel applications.

Learn more
Contact an expert

Product information

   Mobilgard™ M20 Series performance profile 712.539 KB/pdf
Download Share

Features and benefits

Mobilgard M20 Series oils have high performance thermal and oxidation stability. They have excellent TBN retention and resistance to viscosity increases over long operating periods. They also promote a high level of engine cleanliness with protection against wear. Compared to other medium-speed engine oils, they have excellent lube/fuel compatibility and separate easily from water. When used as recommended and in conjunction with Mobil Serv℠ Lubricant Analysis, leveraging ExxonMobil’s patented Detecting Asphaltene Contamination (DAC) testing, Mobilgard M20 Series oils provide the following benefits:

Advantages and potential benefits
Excellent thermal and oxidation stability Reduced deposits in piston undercrown and ring belt areas
Improved antiwear properties Extends the life of critical wear surfaces
Advanced detergency/dispersancy Clean camshaft and crankcase spaces
Outstanding rust and corrosion properties Protects wear surfaces from water and acidic corrosion
High Residual Fuel Compatibility Reduced sludge formation, longer oil life, cleaner engines
Low volatility base stocks Reduced lubricant consumption
Excellent TBN Reserve and Retention Combats fuel/combustion related corrosion and deposits


Mobilgard M20 Series, M420 by ExxonMobil is a premium, extra-high-performance 20 TBN engine oil designed for use in the residual, distillate and LNG-fuelled medium-speed diesel applications found in marine and stationary power industries. M20 Series is an extension to the outstanding Mobilgard M Series trunk piston engine oils and is specifically formulated to support the transition to lower sulphur fuels in light of fuel regulations.

High-performance additive detergent technology is utilised to provide outstanding residual fuel compatibility characteristics for excellent engine cleanliness, especially in crankcase, camshaft areas, ring belt and piston undercrowns. Mobilgard M20 Series oils also demonstrate excellent high temperature oxidation and thermal stability, low volatility, and high load carrying properties and corrosion protection across varying fuel grades.

  • Man ES
  • Wartsila
  • Cruise and Ferry
  • Inland and Coastal
  • Deep Sea Shipping Industry
  • Short Sea Shipping
  • Corrosion protection
  • Enhanced Wear Protection
  • Extended Life
  • High Temperature
  • ships at sea

    Journey to 2020

    ExxonMobil has the solutions and expertise to help vessels comply with the IMO’s global 0.50% fuel sulphur cap.

    Routes to compliance
  • Signum Marine Fuels and Lubricant Analysis engineer testing lubricant

    Mobil Serv℠ Lubricant Analysis

    This state-of- the-art programme helps you prolong engine life, avoid unscheduled downtime and maintain equipment reliability.

    View service
  • Shipping port with crane

    Marine news and resources

    ExxonMobil stays abreast of the latest industry news, insights and resources to help you navigate crucial issues and establish effective solutions for optimal vessel operation.

    Learn more
  • Cargo shipping port at night

    Ports directory

    Use the lubricants ports and services directory to view our offer.

    Learn more