Castrol Fork Oil 10W is an advanced mineral based suspension fluid designed to provide the optimum damping performance in all on and off road suspensions. Its highly refined basestock and naturally high viscosity index will provide superior anti-fade damping performance over a wide temperature range. Castrol Fork Oil allows air release and anti-fade performance under the most arduous conditions such as found in racing. At low and high speeds there is a minimum suspension unit "stiction" with good operation of suspension units under a wide range of operating conditions.