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 X
MAN M 3271-2 X

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

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.


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.