Synthetic fluid with special additives designed to optimise the operation of the brake system. DOT 4 is especially formulated to offer increased safety against water contamination that can result in a lower operational efficiency of the brake system. It is suitable for every brake system, which utilises synthetic brake fluids (not mineral oils) and requires DOT 4. It should not be mixed with either brake fluids based on mineral oils or DOT 5 brake fluids.
SAE J1703, FMVSS No. 116 (§571.116)