Mobil Pegasus™ 801

Mobil industrial , Germany

Gas Engine Oil

Product Description

Mobil Pegasus™ 801 is an SAE 40 premium performance gas engine oil intended for the lubrication of all classes of gas engines operating at low, medium and high speeds where low ash or ashless oils are recommended. It provides outstanding engine cleanliness and performance by helping to prevent the formation of carbon and ash deposits on pistons, in ring belt areas, on exhaust and intake ports, on valves and valve stems and in combustion chambers. Mobil Pegasus 801 also reduces the potential for port carboning of two-cycle gas engines. It minimizes engine wear and protects valve faces, seats and guides of turbocharged, four-cycle engines. Mobil Pegasus 801 provides exceptional protection against scuffing in demanding engine applications and also provides excellent protection against corrosion of internal engine components. Filter and oil life can be extended and the high performance capability of the Mobil Pegasus 801 can also help to extend the time between engine maintenance and overhaul periods.

The Mobil Pegasus 801 is the latest generation of ashless detergent and anti-scuff gas engine oil formulated from highly refined base oils and an advanced technology additive system. It is engineered to provide a high level of chemical and thermal stability resulting in cleaner engines and higher engine performance. Mobil Pegasus 801 provides exceptional cleanliness and optimum wear protection in the most severe applications, without the disadvantage of increased ash deposits.


Features and Benefits

Mobil Pegasus 801 provides outstanding performance in both two- and four-cycle gas engines making it a good choice for all applications where ashless and low-ash oils are recommended. It's advanced additive system protects high BMEP engines against scuffing, scoring and wear particularly during critical break-in periods. This performance can help to provide long engine life and low maintenance costs. Mobil Pegasus 801 has demonstrated outstanding performance over an exceptionally wide range of engines and operating conditions. Where mixed engines are in service Mobil Pegasus 801 provides a single product which simplifies inventory and reduces the potential for product misapplication.

FeaturesAdvantages and Potential Benefits
Outstanding Oxidation StabilityLonger engine and oil life
Cleaner engines
Extended filter life
Advanced Technology Very Low Ash FormulationLower levels of port carboning (two-cycle engines)
Reduced valve and combustion chamber ash and carbon build-up
Longer spark plug life
Outstanding Anti-wear and Anti-scuff ProtectionLess engine wear
Increased engine life
Excellent break-in protection for high BMEP engines
Improved ring, piston and liner life
Exceptional Nitration ResistanceLess engine sludging
Improved filter life
Reduced engine deposits
High Level Corrosion ProtectionProtects engine components against corrosive wear
Longer engine life and lower maintenance costs



  • Mobil Pegasus 801 is intended for the lubrication of the crankcase, power cylinders, and compressor cylinders of spark-ignited, two- and four-cycle gas engines operating on clean fuel.
  • Ideal for engines that drive generators for power production or gas compressors in gathering, transmission, storage, and distribution of natural gas.
  • Ebulliently cooled engines
  • Engines in remote locations which operate virtually unattended for long periods. In many cases, the engines are operated at, or in excess of full-rated output, while other applications are intermittent or stand-by service. Reliability, is therefore essential.
  • Mobil Pegasus 801 oils show excellent results in multipurpose natural gas engine applications, particularly involving highly turbocharged engines requiring anti-scuff protection for cylinder liners and piston skirts.
  • When natural or petroleum gas is being compressed and is dry and free of suspended liquids or corrosive components, the compressor cylinders usually are lubricated with the same oil as the engine crankcase. Mobil Pegasus 801 has been successful in this service.


Specifications and Approvals

Pegasus 801 recommended for use in applications requiring:
Ashless or low-ash gas engine oils
Outstanding anti-scuff protection
Wide range of mixed gas engine designs


Typical Properties

Pegasus 801 
SAE Grade40
Viscosity, ASTM D 445 
cSt @ 40º C125
cSt @ 100º C13.2
Viscosity Index, ASTM D 227097
Sulfated Ash, wt%, ASTM D 8740.13
Total Base #, mg KOH/g, ASTM D 28962.2
Pour Point, ºC, ASTM D 97-15
Flash Point, ºC, ASTM D 92249
Density @15º C kg/l, ASTM D 12980.886


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.

The Mobil logotype, the Pegasus design and Delvac are trademarks of ExxonMobil Corporation, or one of its subsidiaries.


ExxonMobil Lubricants & Specialties Europe, division of ExxonMobil Petroleum & Chemicals BVBA. 
This information relates only to products supplied in Europe (including Turkey) and the Former Soviet Union.

B-2030 Antwerpen

Sollten Sie Fragen zu Mobil Produkten oder Services haben, wenden Sie sich bitte an unser Technical Helpdesk:


Typische Eigenschaften sind solche die mit normalen Produktionabweichungen erlangt werden and stellen keine Spezifikation dar. Aufgrund der Herstellung in verschiedenen Schmierstoffmischanlagen sind auch unter normalen Herstellungsbedingungen Produktabweichungen zu erwarten, die die Produktleistung jedoch nicht beeinträchtigen. Die hierin enthaltenen Informationen können sich ohne weitere Benachrichtigung ändern. Möglicherweise sind einige Produkte vor Ort nicht erhältlich. Für weitere Informationen wenden Sie sich bitte an Ihren örtlichen ExxonMobil Kontakt oder besuchen Sie unsere Internetseite unter     
Unsere US-amerikanische Muttergesellschaft, die Exxon Mobil Corporation, hat in ihrem Konzernverbund zahlreiche Tochtergesellschaften, viele von ihnen haben Namen, die die Begriffe Esso, Mobil oder ExxonMobil enthalten. Aus Vereinfachungsgründen werden diese Begriffe sowie Formulieungen wie Konzern, Gesellschaft, unser, wir und ihre stellenweise als verkürtze Bezugnahme auf bestimmte Gesellschaften oder Gruppen von Gesellschaften verwandt. Ebenso werden gelegentlich vereinfachende Beschreibungen gewählt, um globale oder regionale operative Einheiten bzw. global oder regional organisierte Sparten zu bezeichnen. Gleichermaßen hat ExxonMobil Geschäftsbeziehungen zu Tausenden von Kunden, Lieferanten, Behörden, Pächtern und andere Geschäftspartnern. In diesem Zusammenhang werden ebenfalls aus Vereinfachungsgründen Begriffe wie Unternehmen, Partner und andere verwandt, um eine Geschäftbeziehung zu kennzeichnen. Derlei Bezeichnungen mögen nicht in jedem Falle exakt die konkrete Rechtsbeziehung widerspiegeln.