Mobil Glygoyle 100
ISO VG 100 extreme pressure, anti-wear gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 100 cSt | ASTM D445 |
| KV100 | 17.3 cSt | ASTM D445 |
| Viscosity index | 190 | ASTM D2270 |
| Pour point | -30 °C | ASTM D97 |
| Flash point | 265 °C | ASTM D92 |
| Density at 15 °C | 1.079 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 100 (90–110 cSt).
- Computed viscosity index is 190, within 2 points of the listed 190.
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, Anti-Wear
- Synthetic: Synthetic
- Base oil: V PAG
- AGMA class: AS
- FZG fail stage: >=12
- Copper: 1B
- Note: Gear, bearing, compressor. Synthetic PAG. Food contact. EP, AW
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 Synthetic 800/100 | 58 | same ISO 100, VI 205 vs 190, additive ep, synthetic, flash within 15 °C, AGMA AS |
| Shell Omala S3 W 100 | 23 | same ISO 100, VI 238 vs 190, additive aw, FZG 12 |
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: Mobil, Glygoyle, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Mobil Glygoyle 100 an ISO VG 100 oil?
Yes. The catalogue lists it as ISO VG 100, which is a kinematic viscosity of 100 cSt at 40 °C, plus or minus 10 percent (90 to 110 cSt). Confirm the current data sheet before you fill a machine.
What is a Mobil Glygoyle 100 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 Glygoyle 100 be mixed with mineral oil or PAO?
No. This oil is a PAG (polyalkylene glycol). PAG does not mix with mineral oil or PAO. Drain and flush before changing into it or out of it.
Report a data error
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