Castrol Molub-Alloy GM 140/460
ISO VG 460 r&o, extreme pressure gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 460 cSt | ASTM D445 |
| KV100 | 30.6 cSt | ASTM D445 |
| Viscosity index | 95 | ASTM D2270 |
| Pour point | -15 °C | ASTM D97 |
| Flash point | 240 °C | ASTM D92 |
| Density at 15 °C | 0.9 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 460 (414–506 cSt).
- Computed viscosity index is 96, within 2 points of the listed 95.
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: R&O, Extreme Pressure
- Synthetic: Conventional
- AGMA class: AS
- FZG fail stage: >=12
- Copper: Unlisted
- Note: Enclosed Gears, Mineral Oil
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 |
|---|---|---|
| Shell Omala S2 G 460 | 93 | same ISO 460, VI 97 vs 95, additive ep/ro, conventional, pour -12 vs -15, AGMA AS, buyable now |
| Shell Omala S2 GX 460 | 93 | same ISO 460, VI 97 vs 95, additive ep/ro, conventional, pour -12 vs -15, flash within 15 °C, AGMA AS |
| Shell Omala F 460 | 88 | same ISO 460, VI 97 vs 95, additive ep/ro, conventional, pour -9 vs -15, AGMA AS |
| Mobil 600 XP 460 | 87 | same ISO 460, VI 96 vs 95, additive ep, conventional, pour -15 vs -15, flash within 15 °C, AGMA AS, buyable now |
| Mobil EP 460 | 82 | same ISO 460, VI 96 vs 95, additive ep, conventional, pour -15 vs -15, flash within 15 °C, AGMA AS |
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, Molub-Alloy GM, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Castrol Molub-Alloy GM 140/460 an ISO VG 460 oil?
Yes. The catalogue lists it as ISO VG 460, which is a kinematic viscosity of 460 cSt at 40 °C, plus or minus 10 percent (414 to 506 cSt). Confirm the current data sheet before you fill a machine.
What is a Castrol Molub-Alloy GM 140/460 equivalent?
Published oils in the same application and grade include Shell Omala S2 G 460, Shell Omala S2 GX 460, Shell Omala F 460. The match is from typical data-sheet values, not from an OEM approval. It is not an exact equivalent. Confirm the substitute with the machine builder.
Can Castrol Molub-Alloy GM 140/460 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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