Mobil Pegasus 605

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Mobil Pegasus 605

Gas Engine Oil

Mobil Pegasus™ 605 is a high performance natural gas engine oil primarily intended for the lubrication of modern medium and high-speed four-cycle engines operating on fuel that contains corrosive materials such as hydrogen sulphide or halogens (compounds containing chlorine, fluorine, etc.). These engines are generally of the lean-burn design where increased manifold pressures prevent sufficient lubricant from reaching the valve guide areas resulting in low oil consumption which can lead to valve guide wear and valve recession. This effect also increases the potential for wear and acid attack of upper cylinder components from the corrosive materials generated during combustion. The Mobil Pegasus 605 is a 0.5% ash gas engine oil with exceptional reserve alkalinity designed to offset the negative effects of acidic materials on engine components. The excellent corrosion protection properties helps prevent corrosive wear in cylinders, valve areas and bearings which can result in longer engine life and lower maintenance costs. Mobil Pegasus 605 provides excellent anti-wear and anti-scuff performance which helps assure minimal piston scuffing, scoring and low cylinder liner and piston ring wear. This oil can also be used for the lubrication of the reciprocating compressors in landfill and biomas gas applications.

Mobil Pegasus 605 is formulated from high quality mineral base oils combined with an advanced technology, low ash additive system designed to provide excellent protection of engine and compressor components. This product exhibits a high level of chemical stability and resistance to oxidation and nitration. Pegasus 605 offers outstanding resistance to valve train wear and protection against deposit formation. These performance advantages combined with the very effective detergency and dispersancy characteristics helps control the formation of ash and carbon deposits that could result in poor engine performance and detonation. This product also compatible for use in gas engines equipped with catalytic converters.

Features and Benefits

Mobil Pegasus 605 Gas Engine Oil provides an additional margin of protection in those applications using contaminated fuel. Its excellent detergent / dispersant technology also results in cleaner engines, lower wear rates and improved engine performance. The use of this product can result in reduced maintenance costs and improved production capacity. Its excellent chemical and oxidation stability can result in longer drain periods and reduced filter costs. The high reserve alkalinity of this product allows its use in engines operating on fuels with low to moderate amounts of corrosive materials in the fuel gas.

Features Advantages and Potential Benefits
Optimised TBN and Reserve Alkalinity Controls wear and corrosion when using contaminated gas
Protects valve seats and faces on four-cycle engines
Controls combustion chamber ash formation and improves spark plug performance
Outstanding Anti-wear and Anti-scuff Properties Lower wear of engine components
Reduced scuffing of liners in highly loaded gas engines
Provides excellent break-in protection
Excellent Oxidation and Chemical Stability Cleaner engines
Extended drain intervals
Reduced filter costs
Excellent resistance to oxidation and nitration
Effective Corrosion Resistance Reduces valve guide wear in four-cycle gas engines
Protects bearings and internal components
Exceptional Detergent / Dispersant Properties Neutralises formation of acids in the oil
Protection of upper cylinder and valve train components
Cleaner engines
Longer filter life
Non-zinc and Non-phosphorus Formulation Improves catalytic converter performance and longer life

Applications

Note: Engines operating on fuel gas with elevated levels of sulphur or halogens should also have coolant (jacket water) and oil temperatures raised.

  • Gas engines operating on fuel that contains moderate levels of hydrogen sulphide (H2S)
  • Engines operating on fuel containing other corrosive materials such as TOHCl (Total Organic Halides as Chloride) such as landfill or biomas gas
  • Spark ignited four-cycle gas engines with very low lube oil consumption
  • Medium and high speed four-cycle engines equipped with catalytic converters requiring a low ash gas engine oil
  • Engines experiencing valve train wear and corrosion
  • Reciprocating compressors operating on natural gas that contains sulphur or chlorine compounds
  • High output or naturally aspirated engines operating at or in excess of rated capacity under high temperatures

Specifications and Approvals

Mobil Pegasus 605 has the following builder approvals:
Waukesha for landfill use

MTU Onsite Energy Series 400 Gas Engines

MWM GmbH TR 0199-99-2105, Lube Oils for Gas Engines

Typical Properties

Mobil Pegasus 605
SAE Grade 40
Viscosity, ASTM D 445
cSt @ 40 ºC 124
cSt @ 100 ºC 13.2
Viscosity Index, ASTM D 2270 100
Sulfated Ash, wt%, ASTM D 874 0.5
TBN #, mg KOH/g, ASTM D 2896 7.1
Pour Point, ºC, ASTM D 97 -15
Flash Point, ºC, ASTM D 92 262
Density @ 15.6 ºC, ASTM D 4052, kg/L 0.89

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.

Remark

It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.