Delivers improved gear protection.

Delivers extended anti-shudder durability.

Delivers extended clutch-friction durability.

Excellent corrosion and foaming resistance.

Excellent thermal and oxidative stability that helps to prevent deposits and oil thickening.

Castrol TranSynd TES 668 is a premium, full-synthetic automatic transmission fluid specifically formulated for Allison Transmission on-highway automatic transmissions. TranSynd 668 provides oxidative stability, anti-wear performance, and friction durability, as well as TES 668 specification differentiators such as extended anti-shudder durability and extended clutch friction durability. This fluid features an Allison TES 668 approval. The TES 668 spec is fully backwards compatible for TES 295 applications.