Liqui Moly Pro-Line Automatic Transmission Cleaner 1 L — concentrated service additive for varnish, sludge removal and smoother sh

Liqui Moly Pro-Line Automatic Transmission Cleaner is a concentrated service additive designed to remove deposits and residues from automatic transmission circuits, restoring smoother gear shifts and preparing systems for fresh ATF.

Made for workshop use, this 1-liter treatment is formulated to flush varnish, lacquer and sludge that build up in valve bodies, torque converters and fluid passages over time. Using the cleaner before an oil change or as part of a transmission service helps technicians evaluate internal condition and improves the environment for new transmission fluid and seals.

How does this cleaner work inside automatic transmissions?

The formula dissolves and loosens deposits that restrict fluid flow and affect valve movement without mechanically altering parts. It flows with the ATF through circuits, lifting varnish and sticky residues so they can be drained or flushed out during service.

• Breaks down varnish, lacquer and sludge in valve bodies and passages.
• Improves fluid circulation to torque converters and hydraulic circuits.
• Prepares the transmission for effective contamination removal during drain or flush.

When should a technician use the Liqui Moly Pro-Line cleaner?

Use it as part of scheduled maintenance when shifting becomes sluggish, before replacing ATF, or whenever deposits are suspected. It’s also useful during diagnostic procedures to determine whether contaminants are causing hydraulic or shift problems.

• Prior to complete fluid replacement or system flushes.
• When symptoms like delayed or harsh shifting appear.
• During professional inspections to assess internal cleanliness.

Will this product harm seals, friction materials, or electronics?

Liqui Moly formulates Pro-Line cleaner for compatibility with common transmission materials used in modern units. When used according to service instructions on the bottle and the manufacturer’s guidance, it is intended to be safe for seals and clutch friction linings.

• Developed for use in automatic transmission systems under professional conditions.
• Follow dosage and procedure to avoid overuse or prolonged exposure.
• Consult vehicle manufacturer recommendations when in doubt.

How is the cleaner applied during a service?

Application methods vary by workshop practice: many technicians add the cleaner to the transmission fluid, run the vehicle through operating ranges to circulate the product, then drain and flush the system. Others use it as a concentrated flush through specialized equipment.

• Add to ATF and run the transmission through gears to circulate the cleaner.
• Use with professional flushing machines for targeted removal of residues.
• Drain and replace contaminated fluid after cleaning for best results.

Who this is for: Liqui Moly Pro-Line Automatic Transmission Cleaner is intended for professional mechanics, transmission specialists and experienced DIY technicians who perform scheduled transmission service or diagnostic flushing. It suits workshops that need a concentrated product to remove internal deposits before refilling with new ATF, and for technicians seeking a product formulated specifically for automatic transmission circuits rather than generic detergents.