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Mobilgard 12 Series 

Mobilgard™ 12 Series

Trunk piston engine oil
Mobilgard™ 12 Series high performance diesel oils are designed for use in marine and industrial trunk piston engines operating on low sulphur distillate fuels. They are also compatible with ExxonMobil’s ECA fuel offering.

Developed for use as cylinder and bearing lubricants, they are formulated to deliver resistance to oxidation and viscosity increase over long periods. They also provide:

  • Outstanding corrosion and wear protection
  • Excellent engine cleanliness
  • First-rate water separation properties

Trunk piston diesel engine oils
The Mobilgard 12 Series is engineered with base oils that have a proven performance in diesel engines. An enhanced additive system provides excellent resistance to thermal degradation under moderately severe operating conditions.

Overall benefits
Potential benefits of Mobilgard 12 Series oils include:

  • Maximised periods between inspections, overhaul and cleaning
  • Optimised corrosive wear protection
  • Longer oil service life
  • Minimised oil waste and disposal costs

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