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Mobilgard 12 Series 

Mobilgard™ 12 Series

Diesel Engine Oils
Mobilgard™ 12 Series by ExxonMobil are high performance diesel engine oils developed for use in trunk piston engines operating on low sulphur distillate fuels in marine and industrial applications. They are formulated to have excellent resistance to oxidation and viscosity increase over a long period of service. They have superior water separating properties and provide excellent corrosion protection.

Mobilgard 12 Series is formulated with base oils having proven successful performance in diesel engines. The additive system is balanced to provide excellent resistance to thermal degradation under moderately severe operating conditions. They also provide good engine cleanliness and superior wear protection.

When used as recommended, Mobilgard 12 Series oils provide the following features and potential benefits:

FeaturesAdvantages and Potential Benefits
Excellent thermal and oxidation stabilityExtended periods between inspections, overhaul and cleaning
Improved antiwear propertiesReduced ring and liner wear
Excellent TBN reserve and retentionIncreased protection against corrosive wear
Excellent detergency/dispersancy propertiesIncreased oil service life
Cleaner engines

The Mobilgard 12 Series diesel engine oils are intended for use as cylinder and bearing lubricants in marine and industrial diesel engines operating on distillate fuels or light fuel blends. They are particularly effective in small bore, high speed engines in fishing fleets; in new, severe service engines; and in many types of medium speed engines. They may be used as crankcase lubricants in large crosshead type diesel engines operating on high sulphur fuels. Mobilgard 512 is recommended occasionally by some builders as running-in oil for crosshead type engines.

Mobilgard 12 Series312412512
SAE Grade304050
Specific Gravity at 15ºC0.8960.8990.903
Flash Point, ºC, ASTM D 92266272282
Pour Point, ºC, ASTM D 97-9-9-9
Viscosity, ASTM D 445   
cSt, at 40ºC108142219
cSt, at 100ºC12.014.519.4
Viscosity Index, ASTM D 2270100100100
TBN, mg KOH/g, ASTM D 2896151515
Sulphated Ash, wt%, ASTM D 8742.12.12.1