Shell Spirax S6 ATF A668
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Shell Spirax S6 ATF A668 (previously A295)
Synthetic Extended Drain Heavy Duty Automatic Transmission Fluid
Application Shell Spirax S6 ATF A668
Allison Medium/Heavy Duty Automatic Transmissions Spirax S6 ATF A668 was developed to meet the extended drain requirements of late model medium and heavy duty Allison automatic transmissions. It is particularly suitable for transmissions requiring a TES-668 type product and it is backwards compatible with TES-295 approved fluids. · Municipal fleets· Vans, school buses · Buses and Coaches · Emergency vehicles · Commercial vehicles and trucks · Motor- homes · Heavy duty pickup trucks Spirax S6 ATF A668 can also be used in some Voith heavy duty transmissions as well as those previously serviceable by Dexron® III and Mercon® fluids, and is particularly suited to mixed fleet operations.
Specifications, Approvals & Recommendations of Shell Spirax S6 ATF A668
| Shell Spirax S6 ATF A668 Approvals | Shell Spirax S6 ATF A668 Specifications |
|---|---|
| Allison TES-668 (668-10222021) | Volvo 97340 / 97341 |
| DTFR 13C190 | Ford Mercon |
| DANA-OHTM-ATF-X: 22A-0004 | GM DEX II / IIIG / IIIH |
| Voith H55.6335.xx | JASO 1-A |
| MAN 339 Type V1 | |
| Caterpillar AT-1 |
Properties
| Property | Unit | Method | Value |
| Density @15 °C | kg/m³ | ASTM D4052 | 851 |
| Kinematic viscosity @40 °C | cSt | ASTM D445 | 34.3 |
| Kinematic viscosity @100 °C | cSt | ASTM D445 | 6.9 |
| Flash point (COC) min. | °C | ASTM D92 | 210 |
| Pour point | °C | ASTM D97 | -51 |
Benefits and potential benefits
| Benefit | Description |
| Enhanced long-term protection | Stable viscosity and a consistent oil film help protect mechanical components throughout the drain interval. |
| Extended oil life | Outstanding oxidation resistance helps prevent degradation and deposits, supporting reduced maintenance costs. |
| Improved efficiency & shift quality | Highly stable friction characteristics support smooth shifting and efficient power transfer. |
| Excellent low-temperature behavior | Supports efficient gearbox operation during cold starts and at low ambient temperatures. |
| Good anti-foam & filterability | Promotes effective lubrication and optimal operation of the hydraulic control system. |
Applications
Developed for medium/heavy-duty Allison automatic transmissions with extended drain intervals; backward compatible with Allison-approved TES-295, TES-389 and TES-468 fluids (on-highway list). Also suitable for municipal fleets (refuse trucks), mini & school buses, intercity and coach buses, emergency vehicles, vans and trucks, RVs and motorhomes, heavy-duty pickups, and certain Voith heavy-duty transmissions. Suitable where Dexron® III and Mercon® fluids are specified, ideal for mixed fleets.
Frequently Asked Questions (FAQ)
- 1. Is it approved for extended drains?
Yes, it is approved for very long drain intervals in Allison transmissions. - 2. Can I use it where Dexron® III or Mercon® is required?
Yes, it is suitable for transmissions that specify Dexron® III or Mercon® fluids. - 3. Does it support cold-start performance?
Yes, its excellent low-temperature properties support efficient operation during cold starts.
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