Gas engine Mobil Pegasus sellsheet

Mobil Pegasus™ 1005

Premium Gas Engine Oil

Our Mobil Pegasus™ 1005 premium natural gas engine oil is designed to provide outstanding protection for today’s high-output, low-emissions, four-cycle gas engines. It is formulated to deliver exceptional oxidation stability, nitration resistance and thermal stability.

In addition to protecting heavily loaded valve train components, pistons, liners, bearings and gear trains, Mobil Pegasus 1005 natural gas engine oil also helps:

  • Control wear on critical engine components
  • Reduce oil consumption and need for top-ups
  • Maintain engine cleanliness
  • Improve drain intervals

Equipment lubricant recommendations

Our Mobil Serv℠ Product Selector tool will help you identify lubricant(s) for your specific equipment.

Data sheets

Technical resources

All Mobil Pegasus™ 1005 resources

Features and Benefits

Mobil Pegasus 1005 is a leading member of the Mobil brand of industrial lubricants that enjoy a reputation for innovation, technology leadership and high performance capability.

Mobil Pegasus 1005 offers the following features and potential benefits:



Advantages and Potential Benefits

Extended Oil Life

Improves oil drain interval; reduces number of oil changes and oil purchases, creates less waste oil and labor to help lower operating costs and increase engine availability

Increased engine availability enables higher productivity

Keep Clean Performance

Helps control deposits in combustion chamber and on pistons to maximize engine efficiency and reliability

Helps control deposits in heat exchangers to maximize heat production

Low Oil Consumption

Low oil volatility helps minimize engine and exhaust system deposits to help extend catalytic converter life and extend intervals between heat exchanger cleanings

Helps reduce make up oil additions and lubricant purchases

Exceptional Wear Protection

Helps control wear on critical engine components

Maximizes engine reliability and performance



Mobil Pegasus 1005 is designed for use in:

     •  Caterpillar, MWM GmBh (Formerly Deutz Power Systems), Jenbacher, Rolls Royce-Bergen, Wartsila, Waukesha and other turbocharged, naturally aspirated, medium to high speed four-cycle engines requiring a low ash oil

     •  Lean-burn and stoichiometric four-cycle engines operating under high load, high temperature conditions

     •  High-speed four-cycle gas engines used in cogeneration applications

     •  Natural gas fueled engines equipped with catalytic converters

     •  Applications using alternate fuels containing low levels of sulfur or chlorine

     •  Field gathering operations where sour gas, with H2S content ‹ 0.1% (1000 ppm), may be used as fuel


Specifications and Approvals


This product has the following approvals:

Caterpillar Energy Solutions TR 2105, Lube Oils for Gas Engines (CG132, CG170, CG260)

Caterpillar / MaK 4-Stroke Medium Speed Engine (Gas Operation) incl. GCM-34

INNIO Jenbacher TI 1000-1109 (Class A fuel gas, Type 2 & 3, extended drain)

INNIO Jenbacher TI 1000-1109 (Class A fuel gas, Type 4B & 6E)

INNIO Waukesha Engine 220GL Applications Using Pipeline Quality Gas

INNIO Waukesha Engine Cogeneration / Gas Compression Applications Using Pipeline Quality Gas

MAN M 3271-2

MTU Gas Engines S4000 L61, L62, L63, L64 using natural gas

MTU Gas engines Series 4000 Mx5xN using natural gas

MWM TR 0199-99-2105, Lube Oils for Gas Engines


Bergen Engines AS (former Rolls-Royce Bergen) C-Type Gas Engines

Wartsila 175SG

Wartsila 220SG

Wartsila 25SG

Wartsila 28SG

Wartsila 32DF (Continuous Natural Gas Operation )

Wartsila 34SG

Wartsila 50DF (Continuous Natural Gas Operation)

Wartsila 50SG

Rolls-Royce Solutions Augsburg (former MTU Onsite Energy) Gas Engines Series 400 - natural aspirated engines with natural gas and propane gas

Bergen Engines AS (former Rolls-Royce Bergen) K-Type Gas Engines

Bergen Engines AS (former Rolls-Royce Bergen) B 35:40 Gas Engines

Rolls-Royce Solutions Augsburg (former MTU Onsite Energy) Gas Engines Series 500 - all engines with biogas, sewage gas and landfill gas.

Rolls-Royce Solutions Augsburg (former MTU Onsite Energy) Gas Engines Series 500 - all engines with natural gas and cleaned non-natural gas


This product is recommended for use in applications requiring:



This product meets or exceeds the requirements of:



Properties and Specifications




SAE 40

Base Number - Xylene/Acetic Acid, mg KOH/g, ASTM D2896


Pour Point, °C, ASTM D97


Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Viscosity Index, ASTM D2270


Flash Point, Cleveland Open Cup, °C, ASTM D92


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Ash, Sulfated, mass%, ASTM D874


Density @ 15.6 C, g/cm3, ASTM D4052



Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

  • Enhanced wear protection
  • Extended life
  • Keep clean
  • Oxidation resistance
  • Thermal stability
  • Water resistance
  • Gas engine oils - by sulfated ash
  • Gas engine oils - by OEM
  • Reciprocating Compressor