Mobil Delvac 1 ATF is a fully synthetic fluid recommended by Allison Transmission, Inc. and approved against the Allison TES-295 and TES-468 Specifications. The fluid is designed to meet the demanding requirements of modern heavy-duty automatic transmissions. The synthetic base oil composition enables excellent performance even in some of the harshest operating conditions. It offers outstanding gear shifting and power transfer performance. Versus conventional ATF fluids, the inherently high viscosity index and stability of Mobil Delvac 1 ATF protects against thermal breakdown at high operating temperatures, while still providing outstanding performance at sub-zero temperatures.