Shell Transmission Fluid Mercon Dex3, 12 Packs. For use in both passenger cars and light trucks requiring a fluid that meets the GM Dexron or Ford Mercon specifications. Recommended for power steering units specifying either type of fluid, can be used in Allison Powershift transmissions or other torqueconverters requiring an Allison C-3 or C-4 fluid. Offers high-viscosity index, oxidation stability, corrosion prevention, foam resistance, and controlled frictional properties. Also provides seal compatibility, wear protection, and smoother shifting. Recommended where Ford ESP-M2C138CJ or ESP-M2C166H is specified. Meets requirements for Allison C-4. ATF