The Silkolene RSF 5 Suspension Fluid is a fully-synthetic shock-absorber fluid and special fork oils with a high viscosity index.Race/road/track proven suspension fluidUsed as original equipment in many modern motorcyclesHigh VIThe Silkolene RSF 5 Suspension Fluid is a suspension fluid that is race, road and track proven that is already in use and chosen by many of the markets leading suspension manufactured. Is it also the standard suspension fluid provided in many modern motorcycles. The high VI that is contained in the suspension fluid provides a more consistent damping performance throughout the operating range due to the fact the viscosity changes less with any increasing temperature.ISO 22.1 litre.