Pennzoil ATF+4 Automatic Transmission Fluid is specially formulated to meet the requirements for use as a hydraulic fluid for automatic transmissions used in passenger cars, trucks and sport utility vehicles. It is designed as a robust automatic transmission fluid with improved oxidation stability, excellent low temperature viscosity, friction durability/retention, shear stability and anti-wear performance characteristics vs. ATF+3. Meets the latest vehicle specifications, including Chrysler vehicles. It's backward-compatible with Pennzoil ATF+3, and provides improved performance with temperature, anti-wear, and shear stability, as well as improved oxidation and thermal stability.