The Hot Shot's Secret Blue Diamond +4/D3/M5 Transmission Fluid is recommended for the most common automatic transmission fluid specifications, including but not limited to ATF+4, DEXRON III, and MERCON V. It's formulated to protect against fluid breakdown that is common with severe duty applications, such as heavy towing and challenging terrain and is designed to help clutches, bearings, and bushings last longer and perform more efficiently.