High VI index formulation. Combined with low friction synthetic additives ensuring smooth and assured damping on all terrain. Grade scan be mixed.The FUCHS Silkolene RSF range (formerly known as Pro RSF) has replaced their standard Fork oil Counterparts. Our premium high performance RSF range, available in (2.5, 5, 7.5,10 & 15 W) is a race/road/track proven suspension fluid already in use and chosen bymany of todays market leading suspension manufacturers and currently already used as original equipment in many of todays modern motorcycles.The high VI contained in the Fuchs Silkolene RSF range provides a far more consistent damping performance throughout the operating range due to the fact the viscosity changes less with increasing temperature. The end result being that suspension units will perform at similar high levels all day, throughout continuous riding and not lose any performance or feel compared to standard suspension fluids thinning out as temperature rises and fading in responsiveness. Choosing the correct suspension fluid from the enhanced RSF range could not be easier, simply select the correct ISO rating and/or the preferred Weight from the new blue RSF front labels.