Bardahl Hydraulic Valve Lifters SpecificationsPackaged in a 300 ml bottle Bardahl Hydraulic Valve Lifters is a cleaner that dissolves deposits in the oil channels. Compatible with all types of oil and engines it reduces clicking noise when cold starting and reduces friction and wear on tappets and valve stems. Containing agents resistant to extreme pressure it won't clog oil filters and its action extends engine lifespan.How to use: With the engine warm and switched off pour the contents of the bottle into the engine oil sump. One bottle treats up to 6 litres of oil.