Mobil Pegasus 705
Low-ash mineral oil for natural gas engines and gas compressors
SAE 40
Mobil SHC Pegasus™ 40 is an advanced-technology synthetic natural gas engine oil designed to give today's high-output, low-emission four-cycle gas engines the highest levels of protection. It uses a patented combination of high-quality base stocks and advanced additive technology to deliver exceptional oxidation stability, nitration resistance and thermal stability, with a formulation carefully balanced to provide outstanding anti-wear performance and control the formation of carbon and varnish deposits. The oil's outstanding anti-wear characteristics help protect heavily loaded valve train components, pistons, liners, bearings and gear trains, while its detergent-dispersant system controls carbon and varnish formation to minimize oil consumption and keep engines clean even during extended drain intervals. Its exceptional oxidation stability, nitration resistance and thermal stability offer the potential to extend drain intervals to four to eight times those of conventional gas engine oils, and low volatility further reduces oil consumption and deposit formation. Mobil SHC Pegasus 40 (SAE 40) is recommended for turbocharged, naturally aspirated, medium- to high-speed four-cycle engines requiring a low-ash oil, including lean-burn and stoichiometric engines under high load and temperature, high-speed cogeneration engines, natural gas engines fitted with catalytic converters, and engines running on fuel containing low levels of H2S. It holds the MAN M 3271-2 builder approval.
MAN M 3271-2 — biogas engine oil
The MAN specification variant for engines running biogas or landfill gas, where the oil must neutralise the acids formed from gas impurities.
| Property | Typical value | Method |
|---|---|---|
| Ash, Sulfated, mass% | 0.56 | ASTM D874 |
| Density @ 15.6 Cg/cm3 | 0.847 | ASTM D4052 |
| Flash point, Cleveland Open Cup°C | 210 | ASTM D92 |
| Kinematic viscosity @ 100 Cmm2/s | 13.7 | ASTM D445 |
| Kinematic viscosity @ 40 Cmm2/s | 82 | ASTM D445 |
| Pour point°C | -18 | ASTM D97 |
| Total base numbermgKOH/g | 5.6 | ASTM D2896 |
| Viscosity index | 150 | ASTM D2270 |
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