Castrol Optigear Synthetic X/460
ISO VG 460 gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 455 cSt | ASTM D445 |
| KV100 | 52.1 cSt | ASTM D445 |
| Viscosity index | 179 | ASTM D2270 |
| Pour point | -42 °C | ASTM D97 |
| Flash point | 250 °C | ASTM D92 |
| Density at 15 °C | 0.855 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 460 (414–506 cSt).
- Computed viscosity index is 179, within 2 points of the listed 179.
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
- Synthetic: Unlisted
- Base oil: IV PAO
- FZG fail stage: >=14
- Copper: Unlisted
- Note: Premium synthetic oils for industrial gears operating at wide temperature fluctuations and high loads
Equivalents
| Oil | Score | Why |
|---|---|---|
| Shell Omala S4 GXV 460 | 50 | same ISO 460, VI 179 vs 179, pour -42 vs -42, flash within 15 °C, buyable now |
| Shell Omala S4 GX 460 | 46 | same ISO 460, VI 170 vs 179, pour -36 vs -42, flash within 15 °C, FZG 14 |
| Mobil Mobil SHC Gear 460 | 45 | same ISO 460, VI 184 vs 179, pour -48 vs -42, FZG 14 |
| Mobil Mobil SHC 634 | 40 | same ISO 460, VI 174 vs 179, pour -45 vs -42, buyable now |
| Mobil Mobilgear SHC XMP 460 | 37 | same ISO 460, VI 166 vs 179, pour -36 vs -42, FZG 14 |
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: Castrol, Optigear Synthetic X, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Castrol Optigear Synthetic X/460 an ISO VG 460 oil?
Yes. The catalogue lists it as ISO VG 460, which is a kinematic viscosity of 460 cSt at 40 °C, plus or minus 10 percent (414 to 506 cSt). Confirm the current data sheet before you fill a machine.
What is a Castrol Optigear Synthetic X/460 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 Castrol Optigear Synthetic X/460 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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