Liqui Moly Hydraulic Lifter Additive 2-Pack — Cleans Deposits, Reduces Valvetrain Noise

Liqui Moly 20004 Hydraulic Lifter Additive (2 pack) is a concentrated formula designed to clean, protect, and reduce noise from hydraulic lifters and valvetrain components.

Used as an oil treatment, this Liqui Moly additive targets deposits and sticking points inside hydraulic lifters, helping restore smoother valve action and quieter operation without removing or disassembling engine parts. Compatible with many gasoline and diesel engines that use hydraulic lifters, the product is supplied as two bottles to treat multiple service intervals or more than one vehicle.

How does this additive improve hydraulic lifter behavior?

The formula loosens varnish, sludge and residues that can cause lifters to stick or tick. By cleaning internal passages and restoring proper oil film, lifters can respond more consistently and quietly under varied engine conditions.

• Breaks down deposits that restrict lifter movement
• Restores oil flow through lifter galleries and check valves
• Helps reduce audible valvetrain ticking and irregular lifter travel

When and how should I use the Liqui Moly 20004 additive?

Add the recommended amount to the engine oil during an oil change or before a drive cycle that will warm the engine thoroughly. Follow bottle directions for dosage and allow time and normal engine operation for the cleaning agents to reach lifters and passages.

• Use during oil service or before extended highway driving for best circulation
• One bottle treats a specific oil volume—use both bottles for larger engines or multiple services
• Not a substitute for mechanical repair if lifters are worn or hydraulically failed

Is it safe for my engine and oil system?

Liqui Moly formulates this additive to be compatible with standard engine oils and common sealing materials when used as directed. It cleans and conditions without altering the base oil’s primary properties, but always check compatibility with your vehicle manufacturer’s service recommendations.

• Compatible with conventional and synthetic oils when dosed correctly
• Does not require part disassembly to act on lifters and galleries
• Follow OEM guidelines—avoid use where manufacturer prohibits additives

What improvements can I expect to notice after use?

Results vary by engine condition; many users report reduced lifter noise, smoother idle, and improved responsiveness once deposits are reduced. Benefits appear as the product circulates and cleans lifter passages during normal operation.

• Quieter valvetrain and diminished ticking noises
• Smoother idle and more consistent valve timing response
• Potential for extended service intervals if maintenance is followed

Who is this for: Liqui Moly 20004 Hydraulic Lifter Additive (2 pack) is aimed at car owners, mechanics, and fleet operators who want a non-invasive way to address noisy or sticking hydraulic lifters and to clean valvetrain oil passages. It is appropriate for vehicles that specify use of oil additives and for anyone seeking preventive maintenance or an interim remedy before pursuing further mechanical diagnosis. If your engine exhibits mechanical failure or severe wear, consult a technician—this additive is intended as a cleaning and conditioning treatment, not a guaranteed repair.