Mobilgard M30 Series
Diesel Engine Oils
Mobilgad M30 Series (M330 and M430) by ExxonMobil are premium, extra high performance 30 TBN engine
oils designed for use in the most severe residual-fueled, medium-speed diesel engines used in marine and
stationary power applications. These diesel engine oils have been specially formulated to provide
outstanding residual fuel compatibility characteristics to deliver excellent engine cleanliness, especially in crankcase, camshaft areas, ring belt and piston undercrowns. They provide excellent high temperature oxidation and thermal stability, low volatility, high load-carrying properties and corrosion protection.
Features and Benefits
Mobilgard M30 Series oils have industry-leading 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 superior lube/fuel compatibility and separate easily from water.
When used as recommended, Mobilgard M30 Series oils provide 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
Mobilgard M30 Series oils can be used in most medium-speed trunk piston engine applications. They are
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 new Series of oils is the result of
an extensive research and development program, incorporating ExxonMobil’s patented RFD
(Residual Fuel Detection) Test.
Mobilgard M30 Series oils are designed to meet the needs of engines operating on heavy fuel.
They are 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 these oils provide 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.
SAE Grade 30 40
Specific Gravity at 15ºC 0.907 0.907
Flash Point, ºC, ASTM D 92 244 250
Pour Point, ºC, ASTM D 97 -6 -6
Viscosity, ASTM D 445
cSt, at 40ºC 112 143
cSt, at 100ºC 12.0 14.0
TBN, mg KOH/g, ASTM D 2896 30 30
Sulphated Ash, wt%, ASTM D 874 3.8 3.8
Health and Safety
Based on available information, this product is not expected to produce adverse effects on health
when used for the intended application, following the recommendations provided in the Material
Safety Data Sheet (MSDS). MSDSs are available upon request through your sales contract office,
or via the Internet on http://www.exxonmobil.com. This product should not be used for
purposes other than its intended use. If disposing of used product, take care to protect
The ExxonMobil logo and Mobilgard are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.