Shell Omala S3 A 320
ISO VG 320 anti-wear gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 319 cSt | ASTM D445 |
| KV100 | 45 cSt | ASTM D445 |
| Viscosity index | 200 | ASTM D2270 |
| Pour point | -21 °C | ASTM D97 |
| Flash point | — | ASTM D92 |
| Density at 15 °C | 0.997 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 320 (288–352 cSt).
- Computed viscosity index is 201, within 2 points of the listed 200.
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
- Synthetic: Synthetic
- Base oil: V PAG
- FZG fail stage: 14
- Copper: Unlisted
- Note: Synthetic gear lubricant
Equivalents
| Oil | Score | Why |
|---|---|---|
| Castrol Optigear Synthetic 800/320 | 15 | same ISO 320, VI 230 vs 200, synthetic |
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 S3 A, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Shell Omala S3 A 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 S3 A 320 equivalent?
No other brand in this catalogue clears the equivalents bar for this oil yet (same application, same grade, compatible base oil, and a score of 60 or more). That is not proof that nothing else works. Check the machine manual.
Can Shell Omala S3 A 320 be mixed with mineral oil or PAO?
No. This oil is a PAG (polyalkylene glycol). PAG does not mix with mineral oil or PAO. Drain and flush before changing into it or out of it.
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