Shell Omala S4 GX 680
ISO VG 680 anti-wear, r&o gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 670.4 cSt | ASTM D445 |
| KV100 | 64.9 cSt | ASTM D445 |
| Viscosity index | 169 | ASTM D2270 |
| Pour point | -33 °C | ASTM D97 |
| Flash point | 256 °C | ASTM D92 |
| Density at 15 °C | 0.881 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 680 (612–748 cSt).
- Computed viscosity index is 169, within 2 points of the listed 169.
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: Synthetic
- AGMA class: AS
- FZG fail stage: >=14
- Copper: Unlisted
- Note: Synthetic, gear oil
Equivalents
| Oil | Score | Why |
|---|---|---|
| Chevron Meropa Synthetic EP 680 | 84 | same ISO 680, VI 168 vs 169, additive aw/ro, synthetic, pour -30 vs -33, flash within 15 °C |
| Chevron Meropa EliteSyn XM 680 | 74 | same ISO 680, VI 160 vs 169, additive aw, synthetic, pour -30 vs -33, flash within 15 °C, AGMA AS |
| Chevron Tegra Synthetic Gear 680 | 69 | same ISO 680, VI 168 vs 169, synthetic, pour -31 vs -33, flash within 15 °C, AGMA AS |
| Chevron Meropa EliteSyn WL 680 | 65 | same ISO 680, VI 166 vs 169, additive aw, synthetic, AGMA AS |
| Castrol Optigear Synthetic PD 680 ES | 58 | same ISO 680, VI 167 vs 169, synthetic, pour -36 vs -33, flash within 15 °C |
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 S4 GX, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Shell Omala S4 GX 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 S4 GX 680 equivalent?
Published oils in the same application and grade include Chevron Meropa Synthetic EP 680, Chevron Meropa EliteSyn XM 680, Chevron Tegra Synthetic Gear 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 Shell Omala S4 GX 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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