Shell Omala S4 GX 320
ISO VG 320 anti-wear, r&o gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 335 cSt | ASTM D445 |
| KV100 | 40 cSt | ASTM D445 |
| Viscosity index | 159 | ASTM D2270 |
| Pour point | -42 °C | ASTM D97 |
| Flash point | 252 °C | ASTM D92 |
| Density at 15 °C | 0.883 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 320 (288–352 cSt).
- Computed viscosity index is 172 from the stored KV40 and KV100 (ASTM D2270). The listed index is 159, 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: Synthetic
- Base oil: IV PAO
- AGMA class: AS
- FZG fail stage: >=14
- Copper: Unlisted
- Note: Synthetic, gear oil
Equivalents
| Oil | Score | Why |
|---|---|---|
| Chevron Meropa Synthetic WM 320 | 92 | same ISO 320, VI 156 vs 159, additive aw/ro, synthetic, pour -48 vs -42, flash within 15 °C, AGMA AS |
| Chevron Meropa Synthetic EP 320 | 84 | same ISO 320, VI 165 vs 159, additive aw/ro, synthetic, pour -39 vs -42, flash within 15 °C, buyable now |
| Chevron Meropa EliteSyn XM 320 | 82 | same ISO 320, VI 160 vs 159, additive aw, synthetic, pour -36 vs -42, flash within 15 °C, AGMA AS |
| Mobil Mobilgear SHC XMP 320 | 70 | same ISO 320, VI 164 vs 159, synthetic, pour -38 vs -42, flash within 15 °C, AGMA AS, buyable now |
| Chevron Tegra Synthetic Gear 320 | 64 | same ISO 320, VI 165 vs 159, synthetic, pour -39 vs -42, 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
- Product data sheet
- 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 320 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 Shell Omala S4 GX 320 equivalent?
Published oils in the same application and grade include Chevron Meropa Synthetic WM 320, Chevron Meropa Synthetic EP 320, Chevron Meropa EliteSyn XM 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 Shell Omala S4 GX 320 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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