LIQUI MOLY ATF Additive for Dexron II and III Automatic Transmissions and Power Steering (250 ml)

LIQUI MOLY ATF Additive 20040 is a seal-conditioning treatment added to the fluid in automatic transmissions and power steering systems filled with Dexron II or Dexron III ATF. It cares for the rubber and plastic seals in steering gears and automatic transmissions, helping to prevent and stop leaks caused by hardened and brittle seals. The additive also cleans the small holes and channels inside the transmission and refreshes the performance of the fluid already in service. In an automatic transmission, LIQUI MOLY states that it reduces noise and improves shifting, and that it extends the life of both steering gears and automatic transmissions. It is made in Germany and sold as a single 250 ml tube.

LIQUI MOLY ATF Additive carries a 24-month or 24,000-mile warranty.

The fluid approval sets the limit on where this additive belongs. LIQUI MOLY approves it only for ATF meeting Dexron II and Dexron III, the older Dexron and Mercon generation of fluids, so transmissions and steering systems filled with later fluid specifications fall outside that approval. Treatment is measured against the fluid capacity of the system rather than added by the tube, which lets a smaller power steering circuit take a partial dose. Automatic transmissions and hydraulic power steering systems both rely on their seals to hold fluid under pressure, and a seal that has lost its flexibility with age and heat can let fluid weep past it.

Technical Details

• Manufacturer: LIQUI MOLY
• Part number: 20040
• Product: ATF Additive for automatic transmissions and power steering systems
• Container: 250 ml tube, sold individually
• Treatment ratio: one tube per 8 liters of ATF
• Fluid compatibility: Dexron II and Dexron III ATF only
• Country of manufacture: Germany
• Warranty: 24 months or 24,000 miles

Installation & Tuning Notes

For a power steering system, pour the additive into the power steering reservoir. For an automatic transmission, add it to the ATF through the transmission dipstick tube. Dose it against the system's fluid capacity at one 250 ml tube per 8 liters of ATF.

Common Questions

Will this stop a leak my transmission already has?
LIQUI MOLY states that leaks on transmissions and steering gears caused by hardened and brittle seals are both prevented and eliminated. Leaks from other causes, such as a damaged housing or a cracked line, are outside that claim.

Can I add it to any automatic transmission fluid?
No. It is approved only for systems filled with Dexron II or Dexron III ATF.

LIQUI MOLY has produced its own additives in Ulm, Germany, since 1978, and PMB sells this one for owners of older Dexron-filled systems.

Fitment & Compatibility

This additive is matched by fluid type rather than by vehicle model, and it suits steering gears and automatic transmissions filled with Dexron II or Dexron III ATF. Confirm the fluid specification your transmission or steering system uses before ordering. Send PMB your VIN and we will help confirm the correct fluid for your car.