Castrol Optigear Synthetic X/150
ISO VG 150 gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 150 cSt | ASTM D445 |
| KV100 | — | ASTM D445 |
| Viscosity index | 150 | ASTM D2270 |
| Pour point | — | ASTM D97 |
| Flash point | — | ASTM D92 |
| Density at 15 °C | — | typical |
Grade checks
- KV40 is inside ISO VG 150 (135–165 cSt).
Viscosity and temperature
KV40 and KV100 are both needed before ASTM D341 can draw a curve.
Classification
- Category: Gear
- Synthetic: Synthetic
- Copper: 1
- Note: Premium synthetic oils for industrial gears operating at wide temperature fluctuations and high loads
Equivalents
| Oil | Score | Why |
|---|---|---|
| Chevron Meropa EliteSyn XM 150 | 36 | same ISO 150, VI 159 vs 150, synthetic |
| Mobil Mobil SHC 629 | 34 | same ISO 150, VI 166 vs 150, synthetic, buyable now |
| Chevron Meropa Synthetic EP 150 | 33 | same ISO 150, VI 162 vs 150, synthetic |
| Chevron Tegra Synthetic Gear 150 | 33 | same ISO 150, VI 162 vs 150, synthetic |
| Shell Omala S4 GXV 150 | 26 | same ISO 150, VI 169 vs 150, 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
Related: Castrol, Optigear Synthetic X, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Castrol Optigear Synthetic X/150 an ISO VG 150 oil?
Yes. The catalogue lists it as ISO VG 150, which is a kinematic viscosity of 150 cSt at 40 °C, plus or minus 10 percent (135 to 165 cSt). Confirm the current data sheet before you fill a machine.
What is a Castrol Optigear Synthetic X/150 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/150 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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