Allison ATF 668 Oil Equivalent — Brand Comparison & Cross Reference
Allison TES 668 is a newer automatic transmission fluid specification from Allison Transmission, offering improved performance over TES 295. Required for newer Allison models and provides enhanced protection and efficiency.
Brand Comparison Table
The following table shows the Allison ATF 668 equivalent product from each major lubricant brand. Use this to find a direct substitute when switching suppliers or sourcing alternatives.
| Brand | Product Name |
|---|---|
 Castrol | Transynd 668 |
 Mobil | Delvac 1 ATF 668 |
 Shell | Spirax S6 ATF A668 |
 Valvoline | Syngard 668 ATF |
 Caltex | Delo Syn ATF 668 |
 Fuchs | Titan ATF 5668 |
 Penrite | Convoy HD ATF 668 |
 Gulf Western | Syn TS HD |
Common Applications
- Newer Allison TC10, FuelSense transmissions
- Latest-generation Allison on-highway transmissions
- Vocational vehicles with modern Allison units
- Heavy-duty truck fleets upgrading from TES 295
- Allison xFE transmissions for improved efficiency
Frequently Asked Questions
What is the difference between TES 295 and TES 668?
TES 668 is a newer specification that provides improved oxidation resistance, better shear stability, and enhanced friction durability compared to TES 295. TES 668 fluids are required for newer Allison models and are backward compatible with TES 295 applications.
Can TES 668 fluid be used in older Allison transmissions?
Yes. TES 668 is backward compatible with TES 295 and can be used in older Allison transmissions that previously used TES 295 fluid. However, TES 295 fluid cannot be used where TES 668 is specifically required.
Is TES 668 more expensive than TES 295?
TES 668 fluids typically cost slightly more than TES 295 due to enhanced additive packages. However, the improved performance and potential for longer drain intervals may offset the higher initial cost over the service life.
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