Our Mobil SHC Pegasus™ Series gas engine oils provide maximum protection for high-output, low-emission four-cycle gas engines while also helping to increase fuel efficiency and reduce CO2 emissions. They are formulated for heavily loaded valve train components, pistons, liners, bearings and gear trains.

Proven to increase efficiency up to 1.5 percent*, these lubricants can also:

  • Reduce the formation of carbon and varnish deposits
  • Minimize oil consumption
  • Maintain engine cleanliness during extended drain intervals
  • Lower operating and maintenance costs
  • gauge

    Formulated to potentially help limit fuel consumption

  • gears

    Promotes engine efficiency and reliability by helping control deposits in combustion chamber and piston ring zone

  • fuel efficiency

    Up to 1.5% increase in fuel efficiency compared to standard natural gas engine oils*

  • runtime

    Helps maximize engine availability through long drain intervals — more than 50,000 hours documented

Equipment lubricant recommendations

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

Data sheets

Product information

Features and Benefits

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

Mobil SHC Pegasus offers the following features and potential benefits:

Features Advantages and Potential Benefits
Reduced Fuel Consumption

Patented technology proven to provide up to 1.5% reduction in fuel consumption compared to standard natural gas engine oils*

Extended Oil Life

Improves oil drain interval; reduces number of oil changes, fewer 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 piston ring zone 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

High Level of Wear Protection

Helps control wear on critical engine components  Maintains engine reliability and performance



Mobil SHC Pegasus is designed for use in:

  • 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
  • Gas engines operating on fuel that contains low levels of H2S. Consult OEM for specific fuel gas and  oil drain interval recommendations


Specifications and Approvals

Mobil SHC Pegasus is recommended by ExxonMobil for use in the following applications Mobil SHC Pegasus 
Caterpillar (Acceptance) X


Mobil SHC Pegasus has the following builder approvals: Mobil SHC Pegasus
Waukesha Commercial Quality Natural Gas APG 1000 Approval


Typical Properties

Mobil SHC Pegasus   
SAE Grade 30
Viscosity, ASTM D 445  
mm²/s @ 40ºC 65
mm²/s @ 100ºC 10.5
Viscosity Index, ASTM D 2270 162
TBN, mg KOH/g 5
Pour Point, ºC, ASTM D 97 -42
Flash Point, ºC, ASTM D 92 255
Density @ 15.6 ºC, ASTM D 4052, kg/l 0.842
Sulfated Ash, wt% ASTM D 874 0.5


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.

Technical resources

5W-30 oil reduces Maintenance Downtime | Mobil™

Learn how pairing Mobil Serv Lubricant Analysis and Mobil Delvac 1 can help customers save on both time and money.

Success stories, PDF

5W-40 improves mining haul truck fuel efficiency | Mobil™

Mobil Delvac™ 1 ESP 5W-40 heavy-duty diesel engine oil helps to improve the fuel efficiency of mining haul trucks and generates significant annual savings.

Success stories, PDF

Industrial Synthetic Oil Increases Fuel Efficiency | Mobil™

An Oklahoma-based natural gas pipeline service provider switched to Mobil SHC Pegasus™ 30 synthetic oil for its natural gas engines and reported a 1.5 percent increase in fuel efficiency. Learn more.

Success stories, PDF

Mobil Delvac 1™ ESP 5W-40 extends engine life | Mobil™

Mobil Delvac 1™ ESP 5W-40 helps Grupo Construcciones Planificadas achieve annual operating cost savings by extending oil drain intervals and enhancing diesel engine life.

Success stories, PDF

All Mobil SHC Pegasus resources