Shell Omala S3 GP 1500
ISO VG 1500 anti-wear, r&o, extreme pressure gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 1500 cSt | ASTM D445 |
| KV100 | 82.6 cSt | ASTM D445 |
| Viscosity index | 124 | ASTM D2270 |
| Pour point | -21 °C | ASTM D97 |
| Flash point | 224 °C | ASTM D92 |
| Density at 15 °C | 0.902 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 1500 (1350–1650 cSt).
- Computed viscosity index is 124, within 2 points of the listed 124.
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: Anti-Wear, R&O, Extreme Pressure
- Synthetic: Conventional
- AGMA class: AS
- FZG fail stage: >=12
- Copper: Unlisted
- Note: High and heavy shock (steel, cement, mining, quarrying)
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 |
|---|---|---|
| Chevron Meropa 1500 | 56 | same ISO 1500, VI 113 vs 124, additive aw/ep, pour -19 vs -21, AGMA AS |
| Castrol Molub-Alloy GM 1500 | 48 | same ISO 1500, VI 95 vs 124, additive ep/ro, conventional, flash within 15 °C, AGMA AS |
| Castrol Optigear 1100/1500 | 28 | same ISO 1500, VI 86 vs 124, additive ep, pour -15 vs -21, 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
- No product data sheet link.
- Specs last read from the data sheet on 2026-09-09.
Related: Shell, Omala S3 GP, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Shell Omala S3 GP 1500 an ISO VG 1500 oil?
Yes. The catalogue lists it as ISO VG 1500, which is a kinematic viscosity of 1500 cSt at 40 °C, plus or minus 10 percent (1350 to 1650 cSt). Confirm the current data sheet before you fill a machine.
What is a Shell Omala S3 GP 1500 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 Shell Omala S3 GP 1500 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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