Mobil Mobil SHC 624
ISO VG 32 extreme pressure gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 32 cSt | ASTM D445 |
| KV100 | 6.3 cSt | ASTM D445 |
| Viscosity index | 148 | ASTM D2270 |
| Pour point | -57 °C | ASTM D97 |
| Flash point | 236 °C | ASTM D92 |
| Density at 15 °C | 0.85 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 32 (28.8–35.2 cSt).
- Computed viscosity index is 152 from the stored KV40 and KV100 (ASTM D2270). The listed index is 148, 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
- Attribute: Extreme Pressure
- Synthetic: Synthetic
- FZG fail stage: 11
- Copper: 1B
- Note: Meets AGMA 9005-F16.
Sulfur, EP additives and yellow metal
Extreme-pressure gear oils use sulfur compounds so steel teeth do not weld under shock. That same sulfur can tarnish or pit copper, brass and bronze: a bronze worm wheel, a brass cage, a cooler tube. ASTM D130 sits a polished copper strip in the oil and scores the colour. 1A and 1B are the ratings to keep when yellow metal shares the oil. The strip below is that test at room temperature.
How lubricant-induced copper corrosion works
Equivalents
| Oil | Score | Why |
|---|---|---|
| Castrol Optigear EP 32 | 0 | same ISO 32, VI 100 vs 148 |
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
- Specs last read from the data sheet on 2026-09-09.
Related: Mobil, Mobil SHC 600, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Mobil Mobil SHC 624 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 Mobil Mobil SHC 624 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 Mobil Mobil SHC 624 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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