Chevron Tegra Synthetic Gear 680
ISO VG 680 extreme pressure gear oil
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 646 cSt | ASTM D445 |
| KV100 | 63 cSt | ASTM D445 |
| Viscosity index | 168 | ASTM D2270 |
| Pour point | -31 °C | ASTM D97 |
| Flash point | 242 °C | ASTM D92 |
| Density at 15 °C | 0.8646 g/cm³ | typical |
Grade checks
- KV40 is inside ISO VG 680 (612–748 cSt).
- Computed viscosity index is 168, within 2 points of the listed 168.
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
- Base oil: IV PAO
- AGMA class: AS
- FZG fail stage: >=12
- Copper: Unlisted
- Note: Meets AGMA 9005; AGMA lubricant number 8 EP. Synthetic hydrocarbon base.
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 |
|---|---|---|
| Mobil Mobil SHC 636 | 77 | same ISO 680, VI 181 vs 168, additive ep, synthetic, flash within 15 °C, AGMA AS, buyable now |
| Shell Omala S4 GX 680 | 69 | same ISO 680, VI 169 vs 168, synthetic, pour -33 vs -31, flash within 15 °C, AGMA AS |
| Shell Omala S4 Wheel 680 | 69 | same ISO 680, VI 157 vs 168, additive ep, synthetic, AGMA AS |
| Mobil Mobil SHC Gear 680 | 61 | same ISO 680, VI 192 vs 168, additive ep, synthetic, flash within 15 °C, AGMA AS |
| Mobil Mobil SHC Gear OH 680 | 60 | same ISO 680, VI 193 vs 168, additive ep, synthetic, 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
- Specs last read from the data sheet on 2026-09-09.
Related: Chevron, Tegra Synthetic Gear, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Chevron Tegra Synthetic Gear 680 an ISO VG 680 oil?
Yes. The catalogue lists it as ISO VG 680, which is a kinematic viscosity of 680 cSt at 40 °C, plus or minus 10 percent (612 to 748 cSt). Confirm the current data sheet before you fill a machine.
What is a Chevron Tegra Synthetic Gear 680 equivalent?
Published oils in the same application and grade include Mobil Mobil SHC 636, Shell Omala S4 GX 680, Shell Omala S4 Wheel 680. 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 Chevron Tegra Synthetic Gear 680 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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