Mobil SHC Pegasus™ 40

Mobil industrial , United Kingdom

Synthetic Gas Engine Oil

Product Description

Mobil SHC Pegasus™ 40 is a new category of advanced technology natural gas engine oil designed to provide today’s high output, low-emission four-cycle gas engines with the highest levels of protection. Mobil SHC Pegasus 40 uses a patented combination of high quality base stocks and advanced additive technology to deliver exceptional oxidation stability, nitration resistance and thermal stability. Its formulation has been carefully balanced to provide outstanding anti-wear characteristics and to control the formation of carbon and varnish deposits.


Features and Benefits

  • Outstanding anti-wear characteristics help to protect heavily loaded valve train components, pistons, liners, bearings, and gear trains
  • Excellent detergent-dispersant system controls the formation of carbon and varnish deposits to minimize oil consumption and maintain engine cleanliness even during extended drain intervals
  • Exceptional oxidation stability, nitration resistance and thermal stability provide the opportunity to extend drain intervals by four to eight times that of conventional gas engine oils
  • Low volatility reduces oil consumption and reduces deposit formation



  • Turbocharged, naturally aspirated, medium to high speed four-cycle engines requiring a low ash oil
  • Lean-burn and stoichiometric four-cycle engines operating under high load, high temperature conditions
  • High-speed four-cycle gas engines used in cogeneration applications
  • Natural gas fuelled engines equipped with catalytic converters
  • Gas engines operating on fuel that contains low levels of H2S

Specifications and Approvals 

Mobil SHC Pegasus 40  has the following builder approvals:

MTU Onsite Energy, Series 400 engines with natural gas and propane gas


MAN  M 3271-2 

Typical Properties

Mobil SHC Pegasus 40  
SAE Grade 40
Viscosity, ASTM D 445  
mm²/s @ 40ºC 82
mm²/s @ 100ºC 13
Viscosity Index, ASTM D 2270 150
TBN, ASTM D2896, mg KOH/g 5.6
Pour Point, ºC, ASTM D 97 -18
Flash Point, ºC, ASTM D 92 210
Density @ 15.6 ºC, ASTM D 4052, kg/l 0.847
Sulfated Ash, wt% ASTM D 874 0.56


Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

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Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification.  Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations.  The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit
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