Mobilgard 540 AC

Low-BN cylinder oil for two-stroke marine engines on low-sulphur fuels, LNG or methanol

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Approved by

The whole Mobilgard range

Specifications

Viscosity
SAE 50
Manufacturer code
201540105610
Availability
On request

Typical characteristics

PropertyTypical valueMethod
Viscosity index99ASTM D2270
Total base numbermgKOH/g40ASTM D2896
Kinematic viscosity @ 100 Cmm2/s19ASTM D445
Pour point°C-30ASTM D97
Flash point, Pensky-Martens Closed Cup°C207ASTM D93
Density @ 15.6 Ckg/m3910ASTM D4052
Kinematic viscosity @ 40 Cmm2/s218ASTM D445

Complete documentation

Manufacturer's description

Mobilgard 540 AC is a premium quality, high-performance two-stroke marine diesel engine cylinder oil, granted Category II status by MAN Energy Solutions (Everllence) and Dual Fuel/LNG validation by Winterthur Gas & Diesel (WinGD). Using advanced formulation and detergency technologies combined with a low Base Number (BN), it delivers advanced cleanliness and wear protection while optimising cylinder oil feed rates and managing acid neutralisation across a range of engines and fuels, including all MAN ES two-stroke engines on <0.50%S fuels, LNG, ethane, methanol and LPG, and all WinGD, Wärtsilä and Sulzer two-stroke engines on <1.50%S fuels, LNG and methanol. It is formulated for optimal lubrication at the elevated peak firing pressures and liner temperatures of modern marine two-stroke engines, and can be combined with the Mobil Cylinder Condition Monitoring service to help operators track oil condition in real time and optimise feed rates while maintaining excellent lubrication. It is approved for continuous LNG use and for engines running on methanol, distillate and very low sulphur fuel oils, with additional MAN ES approval for ethane operation. Mobilgard 540 AC combines high-quality, globally consistent base stocks with a superior additive formulation for outstanding detergency, resistance to oxidation and acid formation, and excellent deposit control under the increased temperatures and pressures typical of LNG fuel operation, giving vessel operators a single-product solution across multiple fuel types.

Applications

  • Mobilgard 540 AC is formulated to provide outstanding performance in marine crosshead engines operating on a wide variety of fuel applications, including continuous LNG use.
  • This exceptional cylinder oil has been approved by MAN ES and WinGD for application to all their two-stroke engines operating on LNG, methanol, distillate and very-low-sulphur fuel oil (VLSFO).
  • It has also received MAN ES approval for their two-stroke engines operating on ethane.

Performance & benefits

  • Mobilgard 540 AC combines high-quality, globally consistent base stocks with a superb additive formulation to provide superior detergency capability, leading to cleaner engine and exhaust-system components.
  • It also offers outstanding resistance to oxidation, acid formation and excellent deposit control against the increased temperatures and pressures within combustion cylinders, particularly prevalent in LNG fuel operation.
  • Mobilgard 540 AC offers a single solution, helping vessel operators optimise their inventory and gain access to a range of performance benefits.

Fits

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