Purpose and Specifications

The LIQUI MOLY 21689 Automatic Transmission Cleaner is a powerful 300 ml formula designed to deeply clean your automatic transmission, removing stubborn deposits and residues that cause rough shifting and wear. One can treats 6-9 liters of ATF, making it highly economical for most vehicles. It safely cleans without harming rubber or plastic seals, ensuring smooth gear changes and extending transmission life during routine maintenance.

Ideal for all automatic transmissions, including CVT and DSG types. Add it at operating temperature (around 80-90°C), idle for 10-15 minutes with wheels off the ground, shift through gears, then drain old fluid and replace the filter. Use every 60,000 km or 4 years during fluid changes for peak performance in hot or stop-go driving.

When to Use / Replace?

• Use before every transmission fluid change to dissolve built-up dirt from high-heat operation (up to 120°C).
• Perfect if you notice delayed shifts, slipping gears, or harsh engagement—common after 80,000 km of city driving.
• Shelf life is 4 years unopened; store in a cool, dry place. Professional shops recommend it for flushes every 40,000-60,000 km.

FAQ

Is LIQUI MOLY 21689 safe for my seals? Yes, it gently cleans without attacking rubber or plastic seals, keeping your transmission leak-free.

How much fluid does one can treat? 300 ml handles 6-9 liters of ATF, perfect for standard passenger cars.

Can I use it in CVT or DSG? Absolutely, it's formulated for all automatic transmissions including CVT and DSG.