Mobil Vacuoline 548
ISO VG 680 anti-wear, r&o gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 677 cSt | ASTM D445 |
| KV100 | 36.9 cSt | ASTM D445 |
| Viscosity index | 89 | ASTM D2270 |
| Pour point | -9 °C | ASTM D97 |
| Flash point | 286 °C | ASTM D92 |
| Density at 15 °C | 0.92 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 680 (612–748 cSt).
- Computed viscosity index is 89, within 2 points of the listed 89.
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: Gear
- Attribute: Anti-Wear, R&O
- Synthetic: Conventional
- AGMA class: RO
- FZG fail stage: 12
- Copper: 1A
- Note: Bearings, gears
Equivalents
| Oil | Score | Why |
|---|---|---|
| Shell Omala S2 G 680 | 82 | same ISO 680, VI 92 vs 89, additive aw/ro, conventional, pour -9 vs -9, flash within 15 °C |
| Shell Omala SG 680 | 77 | same ISO 680, VI 92 vs 89, additive aw/ro, conventional, pour -9 vs -9 |
| Castrol Molub-Alloy GM 170W/680 | 70 | same ISO 680, VI 97 vs 89, additive ro, conventional, pour -9 vs -9, FZG 12 |
| Shell Omala S2 GX 680 | 64 | same ISO 680, VI 105 vs 89, additive aw/ro, conventional, pour -9 vs -9 |
| Shell Omala S1 W 680 | 62 | same ISO 680, VI 83 vs 89, additive aw, conventional, pour -6 vs -9 |
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
- Product data sheet
- Safety data sheet
- Specs last read from the data sheet on 2026-09-09.
Related: Mobil, Vacuoline 500 Series, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Mobil Vacuoline 548 an ISO VG 680 oil?
Yes. The catalogue lists it as ISO VG 680, which is a kinematic viscosity of 680 cSt at 40 °C, plus or minus 10 percent (612 to 748 cSt). Confirm the current data sheet before you fill a machine.
What is a Mobil Vacuoline 548 equivalent?
Published oils in the same application and grade include Shell Omala S2 G 680, Shell Omala SG 680, Castrol Molub-Alloy GM 170W/680. The match is from typical data-sheet values, not from an OEM approval. It is not an exact equivalent. Confirm the substitute with the machine builder.
Can Mobil Vacuoline 548 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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