Mobil Pegasus 610 Ultra

Gas Engine Oil

Mobil Pegasus™ 610 Ultra 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.). This product is specially developed to cope with agressive gases with high levels of hydrogen sulphide which significantly limits the oil drain intervals and with high levels of siloxanes whose abrasive effects once burnt can significantly increase wear and reduce engine life.

Mobil Pegasus™ 610 Ultra is a 1.0% sulfated ash, high Total Base Number (TBN) gas engine oil with exceptional reserve alkalinity designed to offset the negative effects of these corrosive materials on engine components.

Mobil Pegasus™ 610 Ultra provides excellent anti-wear and especially anti-scuff performance assuring minimal piston scuffing, scoring and cylinder and ring wear. This product can also be used for the lubrication of the reciprocating compressors in landfill and biomass gas applications.

Mobil Pegasus™ 610 Ultra has a high level of wear protection which helps reduce the scuffing of the liners and extend the overhaul periods and significantly longer operating period.

  • Dial icon

    Enhanced equipment productivity and reduced maintenance downtime and expense due to longer drain intervals

  • Bin icon

    A high performance detergent dispersant system helps keep engines clean despite contaminants common to landfill and biomass gases

  • Cogs icon

    Decreased equipment replacement and disposal costs due to reduced wear and corrosion

Data sheets

Features and Benefits

Mobil Pegasus™ 610 Ultra gas engine oil provides an additional level of protection in those applications using highly contaminated fuel where piston scuffing, high deposit formations and very short drain interval were observed.



Advantages and Potential Benefits

High 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 oil drain intervals even with highly contaminated fuels


Reduced oil 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



Gas engines operating on fuel that contains moderate to high levels of hydrogen sulphide (H2S) and high levels of siloxanes which turn to silicon dioxide in the combustion process causing significant deposits and liner wear.


Engines operating on fuel containing other corrosive components such as TOHCl (Total Organic Halides as Chloride)


Reciprocating compressors operating on natural gas that contains sulphur or halogens


High output or naturally aspirated engines operating at or in excess of rated capacity under high temperatures


Specifications and Approvals

This product has the following approvals:

MAN M 3271-4

MWM TR 0199-99-2105, Lube Oils for Gas Engines
INNIO Jenbacher TI 1000-1109 (Class C fuel gas, Type 2 & 3)
INNIO Jenbacher TI 1000-1109 (Class B fuel gas, Type 2 & 3)
Caterpillar Energy Solutions TR 2105, Lube Oils for Gas Engines (CG132, CG170, CG260)


Properties and Specifications




SAE 40

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


Viscosity Index, ASTM D2270


Density @ 15.6 C, g/ml, ASTM D1298


Pour Point, °C, ASTM D97


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


Ash, Sulfated, mass%, ASTM D874


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


 (*) 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) @

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