Castrol Optigear EP 32
ISO VG 32 gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 32 cSt | ASTM D445 |
| KV100 | 5.3 cSt | ASTM D445 |
| Viscosity index | 100 | ASTM D2270 |
| Pour point | -33 °C | ASTM D97 |
| Flash point | 210 °C | ASTM D92 |
| Density at 15 °C | 0.873 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 32 (28.8–35.2 cSt).
- Computed viscosity index is 96 from the stored KV40 and KV100 (ASTM D2270). The listed index is 100, more than 2 points away.
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: Conventional
- AGMA class: AS
- FZG fail stage: >=12
- Copper: 1
- Note: Extreme pressure gear lubricant, mineral oil
Equivalents
| Oil | Score | Why |
|---|---|---|
| Mobil Mobil SHC 624 | 5 | same ISO 32, VI 148 vs 100, 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
- Product data sheet
- Safety data sheet
- Specs last read from the data sheet on 2026-09-09.
Related: Castrol, Optigear EP, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Castrol Optigear EP 32 an ISO VG 32 oil?
Yes. The catalogue lists it as ISO VG 32, which is a kinematic viscosity of 32 cSt at 40 °C, plus or minus 10 percent (28.8 to 35.2 cSt). Confirm the current data sheet before you fill a machine.
What is a Castrol Optigear EP 32 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 EP 32 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.
Report a data error
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