Castrol Optigear Synthetic PD 150 ES
ISO VG 150 gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 158 cSt | ASTM D445 |
| KV100 | 22.1 cSt | ASTM D445 |
| Viscosity index | 167 | ASTM D2270 |
| Pour point | -51 °C | ASTM D97 |
| Flash point | 250 °C | ASTM D92 |
| Density at 15 °C | 0.851 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 150 (135–165 cSt).
- Computed viscosity index is 167, within 2 points of the listed 167.
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: Synthetic
- Copper: 1
- Note: Synthetic gear lubricant, PAO-based
Equivalents
| Oil | Score | Why |
|---|---|---|
| Mobil Mobil SHC 629 | 59 | same ISO 150, VI 166 vs 167, synthetic, pour -48 vs -51, buyable now |
| Shell Omala S4 GXV 150 | 58 | same ISO 150, VI 169 vs 167, synthetic, pour -45 vs -51, flash within 15 °C |
| Chevron Meropa Synthetic EP 150 | 55 | same ISO 150, VI 162 vs 167, synthetic, pour -51 vs -51, flash within 15 °C |
| Chevron Tegra Synthetic Gear 150 | 55 | same ISO 150, VI 162 vs 167, synthetic, pour -49 vs -51, flash within 15 °C |
| Mobil Mobil SHC Gear 150 | 51 | same ISO 150, VI 176 vs 167, synthetic, pour -54 vs -51, buyable now |
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 PD..ES, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Castrol Optigear Synthetic PD 150 ES 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 PD 150 ES 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 PD 150 ES 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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