100% Synthetic DCT Fluid Dual-clutch transmissions (DCTs) are complex systems essentially consisting of two manual transmissions in the same housing. A specially formulated fluid is required to maintain the high-performance output of these advanced transmissions. AMSOIL 100% Synthetic DCT Fluid is designed to protect high-tech dual-clutch transmissions during the most intense, high-heat operating conditions. It provides the fast, smooth shifts drivers expect.