Mobil Pegasus 505 Series

Gas Engine Oil

Mobil Pegasus™ 505 Series are natural gas engine oils formulated exclusively from specially selected base stocks of high stability. These lubricants provide the excellent performance and economy for a wide variety of engine types, service severity and fuel qualities.

Mobil Pegasus 505 and 505 SAE 30 utilize advanced technology to provide excellent detergency/dispersency protection characteristics along with high-temperature anti-scuff and anti-scoring protection. These oils contain ashless and metallic detergents and are fortified with oxidation inhibitors and antiwear agents. Their use helps minimise carbon and ash deposits.

Mobil Pegasus 505 Series oils combat corrosive wear in cylinders and bearings by neutralising acids. They will also minimize wear of rings, liners and bearings and will help curtail wear in valve seats of turbocharged, four-cycle gas engines. These oils provide good engine cleanliness and filter life.

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Features and Benefits

Mobil Pegasus 505 Series gas engine oils provide clean engines, low wear rates and improved engine performance. The result is the potential for reduced maintenance costs and improved production capacity. Its good chemical and oxidation stability allows for extended drain intervals and filter cost reduction.

FeaturesAdvantages and Potential Benefits
Outstanding Anti-wear and Anti-scuff PropertiesLower wear of engine components
Reduced scuffing of liners of highly loaded gas engines
Provides excellent break-in protection of high BMEP engines
Good Oxidation and Bulk Oil StabilityCleaner engines
Good oil life
Reduced filter costs
Good resistance to oxidation and nitration
Resists coking and formation of undercrown deposits
Low Ash FormulationProtects valve seats and faces on four-cycle engines
Controls combustion chamber ash formation and improves spark plug performance
Less power loss from detonation caused by combustion chamber deposits
Good Corrosion ResistanceProtects bearings and internal components
High Quality BasestocksReduced port blockage, with longer intervals between cleaning



  • Crankcases and power cylinders of spark-ignited two- and four-cycle gas engines
  • Highly loaded 4-cycle engines requiring anti-scuff protection
  • Reciprocating compressor cylinders compressing natural gas
  • High output naturally aspirated or turbocharged engines 
  • Recommended for engines requiring 0.5% sulfated ash
  • Has been successfully used in:
        Dresser Rand
        Fairbanks- Morse


Typical Properties

Mobil Pegasus 505 Series505505 SAE 30
SAE Grade4030
Viscosity, ASTM D 445  
cSt @ 40º C12685
cSt @ 100º C13.110.2
Viscosity Index, ASTM D 22709797
Sulfated Ash, wt%, ASTM D 8740.50.5
TBN #, mg KOH/g, ASTM D 28962.72.7
Pour Point, ºC, ASTM D 97-15-15
Flash Point, ºC, ASTM D 92238236
Density @ 15º C, kg/L0.8860.881


Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS's are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.