DPSF is transmission oil for Dual Pump System — a system made of two sequentially connected rotor oil pumps enabling the rear axle. It is specially formulated for Honda and Acura mechanisms. It is designed together with Honda R&D (research and development center). The transmission fluid is used in the rear differentials of Honda autos with 4 WD. It prevents failures (damages) at high temperatures and loads. It reduces noise and wear of the parts.