Shell Omala S2 G 680
ISO VG 680 anti-wear, r&o, extreme pressure gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 680 cSt | ASTM D445 |
| KV100 | 38 cSt | ASTM D445 |
| Viscosity index | 92 | ASTM D2270 |
| Pour point | -9 °C | ASTM D97 |
| Flash point | 272 °C | ASTM D92 |
| Density at 15 °C | 0.912 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 680 (612–748 cSt).
- Computed viscosity index is 92, within 2 points of the listed 92.
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, Extreme Pressure
- Synthetic: Conventional
- AGMA class: AS
- Copper: Unlisted
- Note: Extreme pressure gear lubricant
Sulfur, EP additives and yellow metal
Extreme-pressure gear oils use sulfur compounds so steel teeth do not weld under shock. That same sulfur can tarnish or pit copper, brass and bronze: a bronze worm wheel, a brass cage, a cooler tube. ASTM D130 sits a polished copper strip in the oil and scores the colour. 1A and 1B are the ratings to keep when yellow metal shares the oil. The strip below is that test at room temperature.
How lubricant-induced copper corrosion works
Equivalents
| Oil | Score | Why |
|---|---|---|
| Mobil 600 XP 680 | 90 | same ISO 680, VI 90 vs 92, additive aw/ep, conventional, pour -9 vs -9, flash within 15 °C, AGMA AS, buyable now |
| Castrol Molub-Alloy GM 170W/680 | 77 | same ISO 680, VI 97 vs 92, additive ep/ro, conventional, pour -9 vs -9, AGMA AS |
| Mobil Vacuoline 548 | 74 | same ISO 680, VI 89 vs 92, additive aw/ro, conventional, pour -9 vs -9, flash within 15 °C |
| Castrol Optigear BM 680 | 72 | same ISO 680, VI 93 vs 92, additive ep, conventional, pour -9 vs -9, AGMA AS |
| Chevron Meropa 680 | 68 | same ISO 680, VI 101 vs 92, additive aw/ep, conventional, flash within 15 °C, AGMA AS |
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
- No product data sheet link.
- Specs last read from the data sheet on 2026-09-09.
Related: Shell, Omala S2 G, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Shell Omala S2 G 680 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 Shell Omala S2 G 680 equivalent?
Published oils in the same application and grade include Mobil 600 XP 680, Castrol Molub-Alloy GM 170W/680, Mobil Vacuoline 548. 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 Shell Omala S2 G 680 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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