We use cookies to help personalise your web experience and improve our websites. To find out more about what cookies are, how we use them and how to delete them, see our Cookie Statement. By continuing to use this site, you are consenting to the use of cookies.


Related product

MobilGard™ advantages

MobilGard™ is the flagship of marine engine oils from ExxonMobil. It is supported by over 60 years of engineering excellence and lubrication technology.

Learn more


Features and Benefits

Mobilgard L540 cylinder oil offers the following features and potential benefits:



Advantages and Potential Benefits

Excellent thermal and oxidation stability

Reduced deposits and sludge formation

Extended oil life

Cleaner engine reduces lay-up time required for overhauls

Exceptional antiwear properties

Reduced liner and ring wear

Excellent anti-scuffing control

Outstanding detergency capability

Superior piston and liner cleanliness increases combustion efficiency and extends periods between piston overhauls

High Viscosity Index and stable basestocks

Reduced cylinder oil consumption



Mobilgard L540 has been developed for marine crosshead engines with increased power and fuel efficiency. Such engines exhibit higher temperatures and pressures in the cylinder, which reduce the lubricant's viscosity and increase the loads which it must withstand. Longer piston strokes have greatly increased the amount of surface to be protected and the amount of time the lubricant must withstand the severe cylinder temperatures and corrosive sulphur acids. Mobilgard L540 has also demonstrated superior performance in earlier engine designs.


To ensure achieving the maximum equipment life possible, particular attention should be paid to the manufacturer's special recommendations regarding the running-in of new rings and liners.


Mobilgard L540 was specially formulated for use in applications with fuel sulphur levels ranging from less than 0.3% up to 1.5%. Applications where the sulphur level is above 1.5% require special consideration and should be discussed with your ExxonMobil representative.


Appropriate feed rates should be verified in all cases by through-the-ports inspection of liners to ensure adequate oil film.


Properties and Specifications



SAE 50

Flash Point, Cleveland Open Cup, °C, ASTM D92


Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Pour Point, °C, ASTM D97


Total Base Number, mgKOH/g, ASTM D2896


Viscosity Index, ASTM D2270


Density @ 15 C, kg/m3, ASTM D4052



Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx

Product information

Deep Sea Shipping Industry
Enhanced Wear Protection

Technical Resources

ExxonMobil launches ECA Insight video series | ExxonMobil marine

ExxonMobil launched its ECA Insight video series to help operators understand the complex changes resulting of recent and impending environmental regulation.

ExxonMobil Voyager newsletter,marine news and resources

Storage and Handling | Marine Lubricants | ExxonMobil Marine

Learn more about best practices for handling, storing and dispending ExxonMobil marine lubricants.

marine news and resources, PDF

Features and Benefits

  • Thermal and oxidation stability can lead to reduced deposits and sludge formation, which can reduce component wear
  • Antiwear properties and anti-scuffing control potentially reduce liner and ring wear
  • Detergency capability leads to potentially cleaner pistons and liners and can help extend periods between overhauls



  • Marine crosshead engines


Typical Properties

SAE Grade
Specific Gravity at 15ºC

Related content

  • ships at sea

    Journey to 2020

    ExxonMobil solutions help ensure compliance with the IMO’s global 0.50% fuel sulphur cap.

    Learn more
  • EMF 5 marine fuels

    EMF.5™ Engineered Marine Fuels

    Read how ExxonMobil’s EMF.5™ marine fuels comply with the IMO 0.50% sulphur cap without compromising quality.

    Learn more
  • heartbeat with a boat shape

    Mobil Serv℠ Cylinder Condition Monitoring

    Mobil Serv Cylinder Condition Monitoring acts as a heart rate monitor for your fleet, providing instant oil analysis results at sea to help reduce costs, crew hours and downtime.

    Learn more
  • Faith containership ship in harbor

    Lubricants port directory

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

    Learn more