Mobil Rarus 426
ISO VG 68 r&o compressor oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 68 cSt | ASTM D445 |
| KV100 | 8.9 cSt | ASTM D445 |
| Viscosity index | 105 | ASTM D2270 |
| Pour point | — | ASTM D97 |
| Flash point | 251 °C | ASTM D92 |
| Density at 15 °C | 0.877 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 68 (61.2–74.8 cSt).
- Computed viscosity index is 104, within 2 points of the listed 105.
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: Compressor
- Attribute: R&O
- Synthetic: Conventional
- Copper: 1A
- Note: Air compressor lubricant
Equivalents
| Oil | Score | Why |
|---|---|---|
| Chevron Capella P 68 | 46 | same ISO 68, VI 109 vs 105, conventional, flash within 15 °C |
| Shell Corena S2 P 68 | 40 | same ISO 68, additive ro, conventional |
| Chevron Cetus PAO 68 | 35 | same ISO 68, VI 141 vs 105, additive ro, flash within 15 °C, buyable now |
| Shell Corena S3 R 68 | 30 | same ISO 68, additive ro, flash within 15 °C |
| Chevron Cetus Hipersyn 68 | 10 | same ISO 68, VI 136 vs 105, flash within 15 °C, buyable now |
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, Rarus 400 Series, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Mobil Rarus 426 an ISO VG 68 oil?
Yes. The catalogue lists it as ISO VG 68, which is a kinematic viscosity of 68 cSt at 40 °C, plus or minus 10 percent (61.2 to 74.8 cSt). Confirm the current data sheet before you fill a machine.
What is a Mobil Rarus 426 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 Rarus 426 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.
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