LIQUI MOLY Diesel Fliess-Fit K is a combination of various high molecular weight ashless additives in a carrier fluid. Fliess-Fit K diesel additive controls the growth of paraffin crystals caused by cold. In the cold, the filterability and pour point of diesel fuel are significantly improved. The effectiveness of the flow improver depends on the type of paraffin and its content in the intermediate distillate.