Mobil Pegasus™ 705

Mobil industrial , Albania

Gas Engine Oil

Product Description

Mobil Pegasus 705 is a premium high performance SAE 40 gas engine oil formulated to lubricate a wide range of natural gas fuelled engines. It is recommended for the newer stoichiometric and lean burn high-speed four-cycle engines that are sensitive to valve face and seat wear. This oil is also recommended for the lubrication of the gas compressors and wide range of engines requiring low ash oil. Pegasus 705 is formulated from select high quality, mineral base oils and an advanced technology additive system engineered to provide excellent protection of engine and compressor components and reduced levels of combustion chamber deposits. It exhibits exceptional chemical stability and resistance to oxidation and nitration resulting in longer oil life and lower filter replacement costs. These performance advantages combined with outstanding detergency and dispersancy properties minimise the formation of ash and carbon deposits that could result in poor engine performance and detonation.


Pegasus 705 exhibits excellent anti-corrosion properties that prevent corrosive wear in cylinders, valve areas and bearings resulting in longer engine life. Its high level of anti-wear performance reduces wear of rings, liners, and bearings. It also provides exceptional valve seat and face protection and reduces the wear and deposit formation in the critical valve guides of highly loaded turbocharged four-cycle engines.


Features and Benefits

Mobil Pegasus 705 gas engine oil provides for cleaner engines, lower wear rates and improved engine performance. The product is particularly beneficial in increasing valve life and engine performance in the newer lean-burn, design high-speed four-cycle engines operating under heavy loads. The result is reduced maintenance costs and improved production capacity. The excellent chemical and oxidation stability results in longer drain periods and reduced filter costs. Pegasus 705 reduces ash and carbon formation in combustion chambers resulting in lower maintenance costs while improving engine performance and reducing fuel costs.



Advantages and Potential Benefits

Excellent Anti-wear and Anti-scuff Properties

Lower wear of engine components

Reduced scuffing of liners of highly loaded gas engines

Provides excellent break-in protection

Exceptional Oxidation and Chemical Stability

Cleaner engines

Extended drain intervals

Reduced filter costs

Excellent resistance to oxidation and nitration

Reduces coking and formation of undercrown deposits

Low Ash Formulation

Reduces valve seat, face and guide wear

Controls combustion chamber ash formation and improves spark plug performance

Improved engine performance

Lower fuel costs

Corrosion Resistance

Reduces valve guide wear in four stroke-cycle gas engines

Protects bearings and internal components

Outstanding Detergency and Dispersancy Properties

Cleaner engines

Improved upper cylinder performance

Longer filter life

Lower maintenance costs



     •  High-speed lean-burn and stoichiometric gas engines sensitive to valve seat recession

     •  Crankcases and power cylinders of spark-ignited two and four-stroke cycle gas engines

     •  Recommended for applications requiring low ash formulations

     •  Reciprocating natural gas compressor cylinders

     •  High output or ambient rated engines operating at or in excess of rated capacity under high temperatures

     •  Engines operating on fuel containing low levels of hydrogen sulphide


Specifications and Approvals

This product has the following approvals:

INNIO Jenbacher TI 1000-1108 (Class A fuel gas, Type 9)

INNIO Jenbacher TI 1000-1109 (Class A fuel gas, Type 2, 3, 4 & 6)

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

MAN M 3271-2

MTU Gas Engines S4000 L32, L33 using natural gas

MWM TR 0199-99-2105, Lube Oils for Gas Engines: TCG2016 < 48.5 kWe / cyl. TCG2020 < 95.0 kWe / cyl. TCG2032 < 260.0 kWe / cy

Perkins Gas Engine Oil - Natural Gas

Wartsila 220SG

Wartsila 28SG

Wartsila 32DF

Wartsila 34SG

Wartsila W12V150SG, W12V175SG, W16V175SG

Wartsila W25SG

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

INNIO Jenbacher TI 1000-1109 (Class C fuel gas, Type 4A, 4B & 4C) 
MTU Gas Engines S4000 L61, L62, L63 using natural gas 


This product meets or exceeds the requirements of:



Properties and Specifications




SAE 40

Pour Point, °C, ASTM D97


Ash, Sulfated, mass%, ASTM D874


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


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


Density 15 C, kg/L, CALCULATED


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


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


Viscosity Index, ASTM D2270



(*) use of other ASTM approved solvents may yield different results. 

Health and safety

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

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.



Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification.  Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations.  The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit 
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