Kayaba has developed their oils specifically for suspension use only. The oil viscosity, the additives, everything has been specifically selected just to reach one goal, the best oil for the best results.  As you know, the oil quality has great influence on the way suspensions work, its specifications mostly effects friction, oil flow, heat dispersion, parts lubrication ... let’s say performance in general.All Kayaba suspensions are being developed from the beginning to be used with the original oil. """""""""