Multi-functional fuel treatment. Protects against cold start wear, corrosion, carburettor icing, deposit build up problems, stalling and rough running at low engine revs. INFORMATION SILKOLENE PRO FST can be used in leaded and unleaded fuel and in both 2 and 4-stroke engines. It reduces the incidence of pre-ignition and also enhances the fuel?s octane rating to a small extent. Recommended mix ratio:- SILKOLENE PRO FST is recommended to be used at a concentration of 1% to 2% For 1% mix 100 parts fuel to 1 part PRO FST For 2% mix 50 parts fuel to1 part PRO FST.