Phillips 66® Triton® 668 ATF is a premium, full-synthetic heavy-duty automatic transmission fluid specifically engineered for truck and bus transmissions operating under severe service conditions or extended drain intervals. This fluid is officially licensed by Allison Transmission to meet the rigorous TES 668® specification, making it the direct, fully-approved successor to TES 295® fluids (like Castrol TranSynd). It is formulated with 100% synthetic base stocks and an advanced additive package that provides superior shear stability, exceptional thermal resistance, and improved friction durability. Triton 668 ensures that heavy-haul vocational vehicles maintain "like-new" shift quality and maximum hardware protection throughout the fluid’s entire service life, even in the most demanding stop-and-go coastal environments.