Liqui moly 1009 hydraulic tappet additive 300ml liqui moly 1009 p align left this hydraulic tappet additive 300ml from liqui moly is added to engine oil to reduce noise produced by worn hydraulic lifters the additive also cleans valves and holes in the lifter while promoting optimum operation can be mixed with all commercially available engine oils p liqui moly 1009 hydraulic tappet additive 300ml