Mobil Pegasus 805 Super

Gas Engine Oil

Mobil Pegasus 805 Super is a premium performance gas engine oil developed to meet the rigorous demands of today's high output four-cycle engines which have been designed to reduce emissions and improve fuel-efficiency. These gas engines generally operate under high load and high temperature conditions and are subjected to a wide range of startup temperatures. Its high viscosity index and low temperature properties provide excellent cold start performance as well as exceptional high temperature lubrication characteristics. The use of the high quality mineral oil base stocks and an advanced low-ash additive technology provides exceptional oxidation stability, nitration resistance and thermal stability. It is a low ash formulation that exhibits medium ash performance characteristics. Mobil Pegasus 805 Super, therefore, offers outstanding valve face, seat and guide protection. Its detergent and dispersant performance controls the formation of carbon deposits, lacquer and sludge resulting in cleaner engines, longer oil life; and reduced filter costs.

Mobil Pegasus 805 Super is designed to provide exceptional protection against piston scuffing, scoring and ring and liner wear. It also exhibits excellent resistance to foaming, good demulsibility and protection against corrosion. It is formulated with very low levels of zinc and phosphorus making it compatible with engines requiring low ash oils and equipped with catalytic converters.


Equipment lubricant recommendations

Data sheets

Features and Benefits

Mobil Pegasus 805 Super is designed to provide optimum engine life and low maintenance costs. It is an excellent choice where high-speed four-cycle engines from various OEMs can be used. Its innovative technology allows for control of valve-train component wear and reduces the potential for scuffing, scoring and accelerated piston and ring wear. The end result is lower costs of operating and maintaining your gas engines.

FeaturesAdvantages and Potential Benefits
Exceptional Oxidation and Nitration ResistanceCleaner engines
Longer oil and filter service
Improved engine performance
Outstanding Anti-wear and Anti-scuff protectionReduced scoring, scuffing and wear of pistons and liners
High level of protection in fully loaded engines
Reduced maintenance costs
High Viscosity IndexWide temperature range performance
Provides quick lubrication to critical components under cold start conditions
Advanced Technology Low Ash Additive SystemExcellent protection of valve train components
Reduced levels of combustion chamber ash
Improved spark plug life
Compatible with engines equipped with catalytic converters
Very Effective Corrosion ProtectionProtects internal engine components from water, coolant and acidic materials
Neutralises acids formed during combustion and oil degradation
Excellent Detergency / Dispersancy PerformanceProtects valve train components
Reduces ash and carbon deposits in combustion chambers
Improves spark plug life and performance
Reduces filter replacement costs
Excellent Low Temperature OperabilityRemote start-up under low ambient temperatures


  • Superior, Waukesha and other turbocharged, naturally aspirated, medium to high speed four-cycle engines requiring a low ash oil
  • Remote start engine applications and engines subjected to cold ambient temperatures at startup
  • Engines experiencing valve face and seat wear
  • Lean-burn and stoichiometric four-cycle engines
  • Engines equipped with catalytic converters
  • Applications using alternate fuels containing low levels of sulphur or chlorine
  • In field gathering operations where sour gas (low levels of liquids and H2S) is used as fuel


Typical Properties

Mobil Pegasus 805 Super 
SAE Grade15W-40
Viscosity, ASTM D 445 
cSt @ 40ºC115
cSt @ 100ºC14.5
CCS Viscosity @ -20º C cp, ASTM D 52936130
Viscosity Index, ASTM D 2270128
Sulfated Ash, wt%, ASTM D 8740.5
Total Base #, mg KOH/g, ASTM D 28966.4
MRV @ -25º C, Apparent Viscosity, ASTM D 4684, cP18500
CCS Viscosity @ -20º C, ASTM D5293, cP6130
Pour Point, ºC, ASTM D 97-30
Flash Point, ºC, ASTM D 92224
Specific Gravity 15.6º C/15.6º C, ASTM D 40520.88


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.

  • Corrosion protection
  • Enhanced wear protection
  • Oxidation resistance
  • Wide temperatures
  • Gas engine oils - by OEM