Mobil Pegasus 1

Approved by

• MAN
• Caterpillar
• Wärtsilä
• Volvo
• MWM
• Jenbacher

Standards & approvals

• MAN M 3271-1

  Official approval

  MAN M 3271-1 — gas engine oil

  MAN's specification for stationary gas engine oils, with controlled ash to protect valves and spark plugs.

• MAN M 3271-2

  Official approval

  MAN M 3271-2 — biogas engine oil

  MAN 3271 variant for biogas or landfill-gas engines, where the oil neutralises acids from gas impurities.

• MWM TR 0199-99-2105

  Official approval

  MWM TR 0199-99-2105 — gas engine oil

  MWM technical requirement for oils in its own stationary gas engines, with controlled ash to protect the valves.

• Wartsila 25SG

  Official approval

  Wartsila 25SG — medium-speed engine oil recommendation

  Wärtsilä's lubricating-oil recommendation for its 25SG medium-speed engine.

Specifications

Brand

Mobil (ExxonMobil)

Range

Mobil Pegasus

Category

Engine oils

Viscosity

SAE 15W-40

Manufacturer code

201525101010

Availability

On request

Compatible vehicles

MAN

TGA, TGS, TGX

Wärtsilä

25SG spark-ignited gas engine

Derived from the vehicle makers' approvals this product meets. Check the specification your vehicle's manual requires.

Typical characteristics

Manufacturer's description

Mobil Pegasus 1 is a high-performance synthetic gas engine oil designed to meet the highest performance requirements of the most demanding naturally aspirated and turbocharged, stoichiometric and lean-burn gas engines. Formulated from wax-free synthetic base oils and a balanced additive system, it delivers performance unattainable with conventional mineral-oil-based gas engine oils, minimizing ash deposits, piston land and ring belt deposits, liner scuffing, and valve seat and face wear. Its outstanding oxidation resistance and inherently high viscosity index maintain a protective lubricant film at high temperatures well beyond the limits of mineral-oil products, while low volatility reduces oil consumption and improves valve lubrication. Mobil Pegasus 1 (SAE 15W-40, 0.5% ash) is recommended for a wide range of gas engine modes, particularly high-speed, four-cycle turbocharged and naturally aspirated engines requiring a nominal 0.5% ash oil, in both stoichiometric and lean-burn designs. It is ideally suited to cogeneration and ebullient-cooled applications thanks to its wide temperature range and extended engine protection, is fully compatible with common gas engine seals and mineral oils (though admixture lowers performance benefits), and may be used with fuel gas containing up to 0.3% sulphur as hydrogen sulphide. The product holds approvals from MAN M 3271-1/-2, MWM TR 0199-99-2105, Wartsila W25SG, INNIO Waukesha Engine 220GL and cogeneration/gas compression applications, and Caterpillar Energy Solutions TR 2105 (CG132, CG170, CG260), plus VOLVO CNG fueled bus engines, delivering longer filter life, cleaner engines, improved valve guide performance, easier cold-temperature cranking, and reduced wear and scuffing under high BMEP conditions.

Applications

• A wide range of gas-engine models.
• Particularly suited to high-speed, four-stroke turbocharged and naturally aspirated gas engines requiring a nominal 0.5% ash gas-engine oil.
• An excellent lubricant for both stoichiometric and lean-burn designs.
• Ideally suited to cogeneration and ebullient-cooled applications, thanks to its wide operating-temperature range and extended engine protection and long oil life.
• Fully compatible with all seals commonly used in gas engines and with mineral oils, though admixture with mineral oils will lower the performance benefits obtainable from this product.
• May be used with gas engines running on alternative fuel gas containing up to 0.3% sulphur as hydrogen sulphide.

Performance & benefits

• Balanced synthetic formulation gives potential for longer filter life, cleaner engines and reduced carbon on ring lands and ring grooves.
• Outstanding oxidation and thermal stability improve valve-guide performance, lower carbon/coking deposits and give effective lubrication under cold start-up conditions.
• Excellent high- and low-temperature performance gives easier engine cranking at low temperatures and improved engine protection at high temperatures.
• Naturally high viscosity index and low volatility give wide-temperature performance, reduced oil consumption and reduced deposit formation in critical engine areas.
• Exceptional anti-wear and anti-scuff protection resists wear and scuffing of liners and pistons, particularly in high-BMEP engines, with the potential for lower fuel costs.
• Low traction coefficient improves engine power and eases starting.

Fits

• Stationary gas engines