All-in-one transmission fluids are designed to work in multiple transmission types All-in-one transmission fluids are versatile lubricants designed to work effectively in multiple types of transmissions, including automatic, manual, and sometimes even CVT systems. These fluids are formulated with a balanced blend of additives to meet the requirements of various transmission designs. They offer good wear protection, thermal stability, and appropriate friction characteristics for different applications. All-in-one solutions can simplify maintenance for fleet operators or individuals with multiple vehicles. However, while convenient, they may not provide the optimized performance of transmission-specific fluids in all cases. It's important to verify compatibility before use.