Castrol Optigear Synthetic PD 68 ES
ISO VG 68 gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 71.5 cSt | ASTM D445 |
| KV100 | 11.3 cSt | ASTM D445 |
| Viscosity index | 151 | ASTM D2270 |
| Pour point | -51 °C | ASTM D97 |
| Flash point | 250 °C | ASTM D92 |
| Density at 15 °C | 0.846 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 68 (61.2–74.8 cSt).
- Computed viscosity index is 151, within 2 points of the listed 151.
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 626 | 46 | same ISO 68, VI 165 vs 151, synthetic, pour -54 vs -51, buyable now |
| Chevron Meropa 68 | 10 | same ISO 68, VI 101 vs 151, flash within 15 °C, buyable now |
| Shell Omala S2 G 68 | 10 | same ISO 68, VI 99 vs 151, flash within 15 °C, buyable now |
| Mobil 600 XP 68 | 5 | same ISO 68, VI 101 vs 151, buyable now |
| Chevron Meropa XL 68 | 0 | same ISO 68, VI 110 vs 151 |
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 68 ES an ISO VG 68 oil?
Yes. The catalogue lists it as ISO VG 68, which is a kinematic viscosity of 68 cSt at 40 °C, plus or minus 10 percent (61.2 to 74.8 cSt). Confirm the current data sheet before you fill a machine.
What is a Castrol Optigear Synthetic PD 68 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 68 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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