Maxima (50-57901) Medium Grade 3WT Synthetic Racing Shock Fluid - 1 Quart Maxima's Synthetic Racing Shock Fluid (SYN RSF) is an ester-based, 100 percent full synthetic race-grade shock fluid formulated to withstand extreme temperatures and loads SYN RSF is blended to the tight specifications required by racing professionals Light 75/390 3wt Zero Fade Formula