Product Description
Mobil Pegasus Special CF is a high quality SAE 15W-40 gas engine oil primarily
intended for the lubrication of crankcases and power cylinders of
spark-ignited two- and four-cycle gas-fueled engines. It is ideally suited for
engines subjected to a wide range of ambient temperatures during startup and
operation. This oil is uniquely formulated to be “Catalyst Friendly” and to
meet the needs of engines with catalytic exhaust systems and stringent air
emission requirements. It is also recommended for the lubrication of the
cylinders and crankcases of reciprocating compressors processing clean natural
gas. Pegasus Special CF is formulated from high quality base oils and a
balanced ashless detergent additive system. It is designed to provide
excellent protection of engine and compressor components while reducing
combustion chamber deposits in all engines and port carboning in two-cycle
engines. Pegasus Special CF exhibits a high level of chemical stability and
resistance to oxidation and nitration to help provide long oil life and lower
filter replacement costs.
Mobil Pegasus Special CF has excellent anti-corrosion properties, which helps
prevent corrosive wear in cylinders, valve areas and bearings resulting in
longer engine life. The anti-wear properties helps minimize wear of rings,
liners, and bearings.
Features and Benefits
Mobil Pegasus Special CF provides excellent low temperature performance
providing faster lubricant supply to critical engine components particularly
under cold start conditions. It provides good engine cleanliness while
maintaining low wear rates which could result in improved engine performance,
reduced maintenance costs and improved production capacity. Pegasus Special CF
exhibits excellent chemical and oxidation stability resulting in long drain
periods and reduced filter costs. Its excellent ashless detergency technology
reduces deposit formation in combustion chambers and in two-cycle engine ports
resulting in lower maintenance costs while improving engine performance and
reducing fuel costs. Mobil Pegasus Special CF is specially formulated to work
with a variety of emission control systems including the latest two cycle,
lean burn oxidizing converter systems designed to meet the MACT (Maximum
Achievable Control Technolgy) requirements of the US EPA Clean Air Act.
Features
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Advantages and Potential Benefits
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Effective Low Temperature Performance
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Improved cold-start lubrication
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Excellent Anti-wear Properties
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Helps lower engine component wear
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Outstanding Oxidation and Chemical Stability
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Cleaner Engines Extended drain interval potential Helps reduce
oil filter costs Excellent resistance to oxidation and nitration
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Ashless Formulation
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Reduces port carboning in two-stroke cycle engines Controls combustion
chamber deposit formation and Improves spark plug performance Helps
Improve engine performance
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Very Good 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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Effective Dispersancy/Detergency
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Cleaner engines Longer oil filter life Helps lower maintenance
costs
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- Effective Low Temperature Performance Improved cold-start lubrication
- Excellent Anti-wear Properties Helps lower engine component wear
- Protection of valuable catalyst in Selective Catalytic Reduction (SCR) emission systems
- Minimization of catalyst fouling, degradation. and poisoning in emission systems
- Outstanding Oxidation and Chemical Stability
- Extended drain interval potential
- Excellent resistance to oxidation and nitration
- Ashless Formulation Reduces port carboning
- Controls combustion chamber deposit formation and Improves spark plug performance
- Helps Improve engine performance
- Protects bearings and internal components
- Effective Dispersancy/Detergency Cleaner engines
- Longer oil filter life
- Helps lower maintenance costs
- Reduces potential number of lubricants needed
Applications
- Engines with Selective Catalytic Reduction (SCR) emission technology and those that must meet stringent air quality requirements
- Crankcases and power cylinders of spark-ignited two- and four-cycle gas engines
- Engines subjected to remote startup under cold ambient conditions
- Mainline applications where engines are shut down for long periods and must start and come on line quickly
- Applications requiring ashless or very low ash formulations
- Applications where port carboning is a potential concern
- Reciprocating compressor cylinders compressing clean natural gas
- Situations where consolidation to fewer lubricants is advantageous
Typical Properties

Mobil Pegasus Special
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| SAE Grade | 15W-40 |
| Viscosity, ASTM D 445 | |
| cSt @ 40º C | 104 |
| cSt @ 100º C | 13.7 |
| Viscosity Index, ASTM D 2270 | 132 |
| Sulfated Ash, wt%, ASTM D 874 | 0.07 |
| Total Base #, mg KOH/g, ASTM D 2896 | 2.4 |
| Pour Point, ºC, ASTM D 97 | -36 |
| Flash Point, ºC, ASTM D 92 | 236 |
| Density 15.6º C, ASTM D 4952, kg/l | 0.88 |
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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