Mobil Vacuoline 537
ISO VG 320 anti-wear, r&o gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 309 cSt | ASTM D445 |
| KV100 | 24.4 cSt | ASTM D445 |
| Viscosity index | 96 | ASTM D2270 |
| Pour point | -12 °C | ASTM D97 |
| Flash point | 288 °C | ASTM D92 |
| Density at 15 °C | 0.89 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 320 (288–352 cSt).
- Computed viscosity index is 100 from the stored KV40 and KV100 (ASTM D2270). The listed index is 96, more than 2 points away.
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 F 320 | 86 | same ISO 320, VI 100 vs 96, additive aw/ro, conventional, pour -18 vs -12, FZG 12 |
| Shell Omala S2 GX 320 | 78 | same ISO 320, VI 98 vs 96, additive aw/ro, conventional, pour -15 vs -12 |
| Shell Omala F Wind Oil 320 | 76 | same ISO 320, VI 100 vs 96, additive aw/ro, conventional, pour -18 vs -12 |
| Shell Omala S2 G 320 | 76 | same ISO 320, VI 100 vs 96, additive aw/ro, conventional, pour -15 vs -12 |
| Castrol Molub-Alloy GM 690/320 | 72 | same ISO 320, VI 102 vs 96, additive ro, conventional, pour -15 vs -12, FZG 12 |
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 537 an ISO VG 320 oil?
Yes. The catalogue lists it as ISO VG 320, which is a kinematic viscosity of 320 cSt at 40 °C, plus or minus 10 percent (288 to 352 cSt). Confirm the current data sheet before you fill a machine.
What is a Mobil Vacuoline 537 equivalent?
Published oils in the same application and grade include Shell Omala F 320, Shell Omala S2 GX 320, Shell Omala F Wind Oil 320. 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 537 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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