ROYAL Syntrans DCT 5 LITRES OF OIL TO SUIT MOST DCT TRANSMISSION’S. Description SynTrans DCT Fluid is a highly advanced, full synthetic, multi-purpose, dual-clutch transmission (DCT) fluid. This application is also known as Direct Shift Gearbox (DSG). SynTrans DCT is specifically designed for the latest DCT/DSG-equipped vehicles and is engineered for severe operating conditions encountered in high-performance street and racing applications. It is formulated using 100% synthetic base oils and additive technologies designed to perform under extreme loads, high operating temperatures, and high-speed conditions.