Generic Hydraulic Lifter Additive 300 ml (2-Pack) — quiets lifters, cleans valve bores

LIQUII MOLY 20004 Hydraulic Lifter Additive is a 300 ml formula (sold as a 2-pack) designed to quiet noisy hydraulic lifters, clean valve bores, and improve oil lubrication when added to engine oil.

This concentrated additive treats hydraulic tappet noise, helps remove deposits from lifter and valve areas, and is compatible with gasoline and diesel engines — including turbocharged models and vehicles with catalytic converters. Each 300 ml bottle treats up to 6 liters (approximately 6.34 quarts) of oil; the two-bottle pack gives you a convenient supply for one larger fill or two smaller services. The product blends with all commercially available engine oils and is engineered to improve oil film strength and promote smoother lifter operation.

How does this additive reduce hydraulic lifter noise?

The formula works by improving lubrication in the lifter and valve bore areas and by loosening varnish and sludge that can interfere with lifter movement. Better film strength and cleaner passages allow hydraulic tappets to maintain correct oil pressure and lash compensation, which reduces clatter and ticking.

• Conditions and enhances oil lubrication at the lifter contact points.
• Loosens and helps dissolve deposits in lifter bores and valve guides.
• Restores smoother lifter actuation without mechanical disassembly.

Will this product work with my engine oil and emissions equipment?

Yes — the additive is formulated to mix with all common engine oils and has been tested for compatibility with catalytic converters. It is suitable for both gasoline and diesel engines and remains appropriate for turbocharged engines, so you can add it during a routine oil service.

• Mixes safely with mineral, semi-synthetic, and fully synthetic oils.
• Compatibility tested for catalytic converters to avoid emissions system harm.
• Safe for use in turbocharged engines under normal service conditions.

How do I use it and what dosage should I follow?

Pour the additive into the engine oil sump with the engine off, then run the engine to allow circulation. Each 300 ml bottle treats up to 6 liters of oil; follow the oil capacity of your vehicle and adjust the number of bottles accordingly.

• One 300 ml bottle treats up to 6 liters (6.34 quarts) of engine oil.
• For oil changes: add the additive before refilling or immediately after, then run the engine briefly.
• For persistent noise, repeat service interval use or consult a mechanic for inspection.

What performance features and practical details should I know?

This additive improves oil lubrication properties, helps clean valve bores and lifter passages, and is engineered for ease of use. It has a measured flash point of 60°C and is supplied as a two-pack for multiple applications or larger oil capacities.

• Improves oil film strength to support smoother lifter movement.
• Cleans valve bores and lifter holes to restore proper flow and seating.
• Flash point listed at 60°C; store and handle per standard oil-additive precautions.
• Sold as a 2-pack — useful for larger engines or two service intervals.

Who is this for: This product is aimed at vehicle owners, DIY mechanics, and professional workshops seeking a straightforward way to address hydraulic lifter noise and to help clean lifter and valve passages without engine disassembly. It is suitable for owners of cars, light trucks, and SUVs with gasoline or diesel engines (including turbocharged units) who want a maintenance additive compatible with catalytic converters and all common engine oils.