Castrol Optigear Synthetic PD 680 ES
ISO VG 680 gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 670 cSt | ASTM D445 |
| KV100 | 64.2 cSt | ASTM D445 |
| Viscosity index | 167 | ASTM D2270 |
| Pour point | -36 °C | ASTM D97 |
| Flash point | 250 °C | ASTM D92 |
| Density at 15 °C | 0.86 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 680 (612–748 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 |
|---|---|---|
| Chevron Meropa EliteSyn WL 680 | 59 | same ISO 680, VI 166 vs 167, synthetic, pour -40 vs -36, flash within 15 °C |
| Chevron Meropa Synthetic EP 680 | 59 | same ISO 680, VI 168 vs 167, synthetic, pour -30 vs -36, flash within 15 °C |
| Chevron Tegra Synthetic Gear 680 | 59 | same ISO 680, VI 168 vs 167, synthetic, pour -31 vs -36, flash within 15 °C |
| Shell Omala S4 GX 680 | 58 | same ISO 680, VI 169 vs 167, synthetic, pour -33 vs -36, flash within 15 °C |
| Chevron Meropa EliteSyn XM 680 | 53 | same ISO 680, VI 160 vs 167, synthetic, pour -30 vs -36, flash within 15 °C |
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 680 ES an ISO VG 680 oil?
Yes. The catalogue lists it as ISO VG 680, which is a kinematic viscosity of 680 cSt at 40 °C, plus or minus 10 percent (612 to 748 cSt). Confirm the current data sheet before you fill a machine.
What is a Castrol Optigear Synthetic PD 680 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 680 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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