Mobilgard™ M40 Series diesel engine oils

View all products in medium speed engine oils

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Product information

   Mobilgard™ M40 performance profile 688.721 KB/pdf
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Technical resources

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Mobilgard M430 provides excellent, trouble-free, long-term protection for dual-fuel engines running predominantly on LNG.

Features and Benefits

Mobilgard M440 oil has outstanding thermal and oxidation stability. It has excellent TBN retention and resistance to viscosity increases over long operating periods. It also promotes a high level of engine cleanliness with protection against wear. Compared to other medium speed engine oils, it has excellent lube/fuel compatibility and separates easily from water.

When used as recommended, Mobilgard M440 oil provides the following benefits:

Features
Advantages and Potential Benefits
Excellent thermal and oxidation stability Reduced deposits in piston undercrown and ring belt areas
Improved anti-wear 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

Applications

Mobilgard M440 oil can be used in most medium-speed trunk piston engine applications. It is recommended for use in main propulsion and auxiliary engines on deep-sea vessels; in main propulsion engines on coastal and river ships; and in stationary power plants. This oil is the result of an extensive research and development program, incorporating ExxonMobil's patented DAC (Detecting Asphaltene Contamination) Test.

Mobilgard M440 oil is designed to meet the needs of engines operating on heavy fuel. It is recommended for use in the latest model medium speed diesel engines and are especially beneficial in engines having low crankcase oil consumption or operating with low cylinder liner temperatures. Relatively high alkalinity reserves in this oil provides superior protection in neutralising the strong acids resulting from the use of high sulphur fuels that find access to the crankcase to promote oil degradation and ring, cylinder, and bearing corrosion.

Typical Properties

M440
SAE Grade 40
Specific Gravity at 15ºC 0.915
Flash Point, ºC, ASTM D 92 242
Pour Point, ºC, ASTM D 97 -6
Viscosity, ASTM D 445

cSt, at 100ºC 14.0
TBN, mg KOH/g, ASTM D 2896 40
Sulphated Ash, wt%, ASTM D 874 5.0
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