Castrol Valvemaster Plus is a lead replacement petrol additive plus octane booster. 250ml treats 250 litres. With a very easy to use measuring device to aid correct dosage when filling up with petrol
Castrol also produce Valvemaster which contains no octane boost.
Many vintage engines will run quite happily on lead free fuel as they were designed and manufactured during a time when there was no lead in petrol, as now. However modern fuels vary in their octane rating so adding a fuel additive/octane booster when filling up may aid smooth running.
