Product Description
Mobil Pegasus 505 Series are premium natural gas engine oils formulated
exclusively from specially selected base stocks of high stability. These
lubricants provide the excellent performance and economy for a wide variety of
engine types, service severity and fuel qualities.
Mobil
Pegasus 505 and 505 SAE 30 utilise advanced technology to provide excellent
detergency/dispersency protection characteristics along with high-temperature
anti-scuff and anti-scoring protection. These oils contain ashless and
metallic detergents and are fortified with oxidation inhibitors and antiwear
agents. Their use helps minimise carbon and ash deposits.
Mobil Pegasus 505 Series oils combat corrosive wear in cylinders and bearings
by neutralising acids. They will also minimise wear of rings, liners and
bearings and will help curtail wear in valve seats of turbocharged, four-cycle
gas engines. These oils provide superior engine cleanliness and filter life.
Features and Benefits
Mobil Pegasus 505 Series gas engine oils provide cleaner engines, lower wear
rates and improved engine performance. The result is the potential for reduced
maintenance costs and improved production capacity. Its good chemical and
oxidation stability allows for extended drain intervals and filter cost
reduction.
Features
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Advantages and Potential Benefits
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Outstanding 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 of high BMEP
engines
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Good Oxidation and Bulk Oil Stability
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Cleaner engines Good oil life Reduced filter costs
Good resistance to oxidation and nitration Resists coking and
formation of undercrown deposits
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Low Ash Formulation
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Protects valve seats and faces on four-cycle engines Controls
combustion chamber ash formation and improves spark plug performance
Less power loss from detonation caused by combustion chamber deposits
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Good Corrosion Resistance
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Protects bearings and internal components
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High Quality Basestocks
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Reduced port blockage, with longer intervals between cleaning
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Applications
- Crankcases and power cylinders of spark-ignited two- and four-cycle gas engines
- Highly loaded 4-cycle engines requiring anti-scuff protection
- Reciprocating compressor cylinders compressing natural gas
- High output or naturally aspirated turbocharged engines operating at or in excess of rated capacity under high temperatures
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Specifications and Approvals

Mobil Pegasus 505 Series meets or exceeds the following industry and builder
specification:
| 
505
| 
505 SAE 30
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| Dresser Rand Category I, II, III | | X |
Typical Properties

Mobil Pegasus 505 Series
| 
505
| 
505 SAE 30
|
| SAE Grade | 40 | 30 |
| Viscosity, ASTM D 445 | | |
| cSt @ 40º C | 126 | 85 |
| cSt @ 100º C | 13.1 | 10.2 |
| Viscosity Index, ASTM D 2270 | 97 | 97 |
| Sulfated Ash, wt%, ASTM D 874 | 0.46 | 0.46 |
| TBN #, mg KOH/g, ASTM D 2896 | 2.7 | 2.7 |
| Pour Point, ºC, ASTM D 97 | -15 | -15 |
| Flash Point, ºC, ASTM D 92 | 238 | 236 |
| Density @ 15º C, kg/L | 0.886 | 0.881 |
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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 are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.
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