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.
Features
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Advantages and Potential Benefits
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Excellent Anti-wear and Anti-scuff Properties
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Lower wear of engine components Reduced scuffing of liners of highly
loaded gas engines Provides excellent break-in protection
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Exceptional Oxidation and Chemical Stability
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Cleaner engines Extended drain intervals Reduced filter costs
Excellent resistance to oxidation and nitration Reduces coking and
formation of undercrown deposits
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Low Ash Formulation
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Reduces valve seat, face and guide wear Controls combustion chamber
ash formation and improves spark plug performance Improved engine
performance Lower fuel costs
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Corrosion Resistance
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Reduces valve guide wear in four stroke-cycle gas engines Protects
bearings and internal components
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Outstanding Detergency and Dispersancy Properties
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Cleaner engines Improved upper cylinder performance Longer
filter life Lower maintenance costs
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Applications
- 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
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Specifications and Approvals

Mobil Pegasus 705 meets the following industry specifications:
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| CATERPILLAR | X |
| JENBACHER TI 1000-1107 | X |
| WARTSILA NSD W25SG | X |
| WARTSILA NSD W12V150SG, W12V175SG, W16V175SG | X |
| GEC ALSTHOM CATEGORY 1 and 2 (Natural Gas) | X |
| DEUTZ MWM (Gas engines operating with special gases with increased exhaust emission) | X |
| MBH VGD 48/42 AND VDG 42/48 | X |
| MDE (Natural gas, propane and non-corrosive sewage gas) | X |
| GEC Alsthom Category I (Landfill gas / digester gas / biogas) | X |
| Ulstein Bergen (Natural gas) | X |

Mobil Pegasus 705 has the following builder approvals:
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| MTU Category 1 (Single grade oils) | X |
| PERKINS NATURAL GAS | X |
| CUMMINS WARTSILA 180 SG and 220 SG | X |
| WARTSILA NSD W34SG | X |
| WARTSILA 32 DF | X |
| WARTSILA NSD 28SG (Natural gas operation) | X |
| WARTSILA 220 SG | X |
| MAN approval 3271-2 | X |
Typical Properties

Mobil Pegasus 705
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| SAE Grade | 40 |
| Viscosity, ASTM D 445 | |
| cSt @ 40º C | 126.2 |
| cSt @ 100º C | 13.2 |
| Viscosity Index, ASTM D 2270 | 98 |
| Sulfated Ash, wt%, ASTM D 874 | 0.52 |
| Total Base #, mg KOH/g, ASTM D 2896 | 5.6 |
| Pour Point, ºC, ASTM D 97 | -18 |
| Flash Point, ºC, ASTM D 92 | 252 |
| Specific Gravity 15.6º C/15.6º C, ASTM D 1298 | 0.887 |
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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 Pegasus are trademarks of ExxonMobil Corporation, or one of its subsidiaries.
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