Castrol Valve Master Plus Unleaded Fuel Additive
Bottled additives are available which can be mixed with either 'Premium' or 'Super' unleaded depending upon application. It usually works out cheaper to use bottled additives than leaded or LRP - work it out for yourself!
Endorsed by the federation of British Historic Vehicle Clubs (FBHVC), having been independently tested and approved, both products offer a high level of protection against valve seat recession under all driving conditions. In addition, Castrol Valvemaster Plus provides an octane boost to premium unleaded petrol which reduces pinking or knocking on high compression or performance application. This also usually avoids the need to re-tune your engine. Treats 250 litres of petrol.