Mobil Pegasus 805 Ultra
Anti-wear gas engine oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 129 cSt | ASTM D445 |
| KV100 | 13.8 cSt | ASTM D445 |
| Viscosity index | 104 | ASTM D2270 |
| Pour point | -21 °C | ASTM D97 |
| Flash point | 279 °C | ASTM D92 |
| Density at 15 °C | 0.885 g/cm³ | typical |
Grade checks
- No ISO grade is stored.
- Computed viscosity index is 103, within 2 points of the listed 104.
Viscosity and temperature
ASTM D341 (Walther) fitted to the published KV40 and KV100. It is an interpolation between those two points, and it is not meaningful below the pour point. Move the control to read a temperature.
Classification
- Category: Gas Engine
- Attribute: Anti-Wear
- Synthetic: Conventional
- Copper: Unlisted
- Note: Gas engine, SAE 40
Equivalents
| Oil | Score | Why |
|---|---|---|
| Shell Mysella S3 N 40 | 50 | KV40 within 10%, additive aw, conventional, pour -18 vs -21 |
| Shell Mysella S3 S 40 | 50 | KV40 within 10%, additive aw, conventional, pour -18 vs -21 |
| Shell Mysella S5 N 40 | 35 | KV40 within 10%, additive aw, pour -18 vs -21 |
Scores use published typical data. This is not an exact equivalent, and it is not an OEM approval. Confirm the substitute with the machine builder.
Documents
Related: Mobil, Pegasus, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
What is a Mobil Pegasus 805 Ultra equivalent?
No other brand in this catalogue clears the equivalents bar for this oil yet (same application, same grade, compatible base oil, and a score of 60 or more). That is not proof that nothing else works. Check the machine manual.
Can Mobil Pegasus 805 Ultra be mixed with another oil?
Mixing two oils that share a base family is sometimes done and sometimes a mistake. Do not mix this oil with a PAG. For any other mix, follow the maker's change-over guidance and the machine manual.
Report a data error
The report is stored for review. It does not change the page by itself, and it is not emailed anywhere yet.