Storage 5 Star racing fuel from Classic Fuel Solutions (CFS) is an ethanol free leaded 5 star fuel with an octane rating of 103 RON. It is capable of being stored for up to 3 years which is perfect for vehicles which do not get used regularly, especially classics with rubber fuel hose and other fuel system components which can be degraded by ethanol. Storage 5 star burns extremely cleanly and has a 103 RON octane so is ideal for very high compression or forced induction engines.Can be stored for up to 3 years with no negative effect5 Star leaded fuel with no ethanol contentWill not effect rubber fuel hose, gaskets or carburettors used on classic vehiclesIdeal for high compression or forced induction engines which require a high octaneR Racing storage 5 star race fuel includes a carefully calculated quantity of TED (lead) to ensure classic and vintage engines are protected against valve seat recession and valve damage.103 RON (Research octane number)98 MON (Motor octane number)10 Litre