LIQUI MOLY ATF Additive Review
By SellySell Editorial Team | Last updated: June 11, 2026
LIQUI MOLY ATF Additive is a 250 ml fluid treatment for automatic transmissions and power-steering systems. The article information identifies it as SKU 5135 and ASIN B004X63XVU. Its main job is to help condition seals, support oil-film strength, and reduce minor fluid-loss problems when the fluid type and system are compatible.
Verdict
LIQUI MOLY ATF Additive is best viewed as a maintenance helper, not a repair in a bottle. It may help with minor seal hardening, light leakage, steering noise, or rougher shifting caused by old fluid and worn seals. It should not be used to cover up major transmission or steering faults.
Key Specs
| Specification | Detail |
|---|---|
| Brand | LIQUI MOLY |
| Product | ATF Additive |
| SKU | 5135 |
| ASIN | B004X63XVU |
| Bottle Size | 250 ml |
| Main Use | Automatic transmissions and compatible power-steering systems |
| Typical Dose | One 250 ml bottle per typical transmission fill, but always follow the vehicle manual and product label |
| Important Limit | Not a fix for severe mechanical damage, slipping clutches, broken parts, or heavy leaks |
What Is This Product?
LIQUI MOLY ATF Additive is a concentrated additive made for use with compatible automatic transmission fluid. It is also described as suitable for power-steering systems where the required fluid type allows this kind of additive.
The stated purpose is simple. It helps condition seals, supports oil-film strength, and can reduce minor oil loss in systems where old seals have started to harden. It may also help clean light deposits inside the fluid system.
Who It Is For
This product makes the most sense for drivers dealing with mild symptoms. Examples include small seepage around seals, steering noise, light shift harshness, or a transmission that feels less smooth than it used to.
It is also a reasonable add-on during a planned fluid service if the vehicle manual, fluid type, and product label all support its use.
Who Should Skip It
Skip this additive if your transmission is already slipping badly, refusing to shift, overheating, grinding, or leaking heavily. Those symptoms point to mechanical or hydraulic problems that need inspection and repair.
Owners of CVT transmissions should be careful. The provided article says this additive is generally not recommended for CVT use. Check the current product label and vehicle manual before adding anything to a CVT, dual-clutch transmission, or sealed transmission system.
Key Features
- Seal conditioning: The additive is described as helping restore seal elasticity in compatible systems.
- Leak support: It may reduce small leaks caused by aged seals, but it cannot repair cracked housings, torn seals, or damaged gaskets.
- Oil-film support: The formula is presented as helping strengthen the lubricating film inside the system.
- Shift and steering feel: The article reports that smoother shifts and quieter steering may appear after use, usually after some driving time.
- Simple dosing: The article lists one 250 ml bottle as the common dose for a typical automatic transmission fill. Always check the product label and service manual first.
Real-World Use
In normal use, LIQUI MOLY ATF Additive should be added only when the fluid level and fluid type are correct. Overfilling a transmission or steering system can cause problems, so the existing fluid level matters.
The provided article says some users notice smoother shifts, reduced chatter, firmer steering feel, or less noise within about 100 to 500 miles. Treat those results as possible outcomes, not a guarantee. The condition of the transmission, the age of the seals, and the correct ATF specification all affect results.
After adding the product, check the fluid level and watch the leak area. If the leak continues, grows, or the transmission behavior gets worse, stop relying on the additive and get the system inspected.
Pros and Cons
Pros
- 250 ml bottle is simple to dose for many typical automatic transmission services
- May help condition aged seals and reduce minor fluid seepage
- Can support smoother shifting or quieter steering when symptoms are mild
- Useful as a maintenance aid when the fluid type and system are compatible
Cons
- Will not fix severe transmission wear, broken parts, or heavy leaks
- CVT use is generally not recommended based on the provided article
- Results can take driving time and are not guaranteed
- Must be matched to the correct fluid specification and fill level
Is It Worth the Price?
LIQUI MOLY ATF Additive is worth considering if the goal is preventive care or help with mild seal-related symptoms. It costs much less than transmission repair, but that does not mean it replaces repair.
The best value case is a vehicle with compatible ATF, minor seepage, and no major drivability symptoms. The weakest value case is a transmission that already slips, overheats, or shows delayed engagement. In that situation, diagnosis comes first.
Alternatives to Consider
Similar products in this category include Lucas Transmission Fix, Bar’s Leaks Transmission Stop Leak, and ATP AT-205 Re-Seal. These are named only for comparison. Check each product label, fluid compatibility, and vehicle manual before using any transmission or steering additive.
Frequently Asked Questions
Is This Additive Compatible With CVT Transmissions?
No. Based on the provided article, it is generally not recommended for CVT transmissions. CVTs use special fluids and friction systems, so adding the wrong product can affect belts, pulleys, clutches, or warranty coverage. Always check the current product label and vehicle manual.
Can It Be Used in Manual Transmissions or Gearboxes?
Do not assume it is suitable for every manual transmission or gearbox. The article mentions possible manual gearbox use only when the specified oil is compatible. Check the gearbox oil requirement and product label before use.
Is the Product Safe for Vehicles With Catalytic Converters?
This additive goes into the transmission or power-steering fluid system, not the fuel or engine oil system. It is not intended to treat exhaust components. Use it only in the systems listed on the product label.
How Long Before Effects Like Reduced Noise Are Noticeable?
The provided article reports a possible range of about 100 to 500 miles. Some users may notice changes sooner, while others may see no clear change. If the noise comes from mechanical damage, the additive will not solve it.
Does It Change the Color or Smell of the Transmission Fluid?
The provided article says it typically does not cause a major change in fluid color or odor. Still, dark, burnt-smelling, or contaminated ATF should be treated as a service warning, not as something an additive can hide.
How Much Should I Use?
The article lists one 250 ml bottle as a common dose for a typical automatic transmission. Do not overfill the system. Check the dipstick or service procedure, then follow the product label and vehicle manual.
Can This Stop a Transmission Leak?
It may help reduce minor seepage from hardened seals. It will not repair a torn seal, cracked case, damaged gasket, loose pan, or broken cooler line. If fluid loss continues, the vehicle needs repair.
Final Verdict
LIQUI MOLY ATF Additive is a practical choice for mild transmission or power-steering symptoms when the system and fluid are compatible. Its strongest use case is seal conditioning and maintenance support. Its biggest limit is clear: it cannot reverse serious wear or mechanical failure.
Use it only as directed, avoid overfilling, and check for leaks after driving. For mild seepage or roughness, it may be worth trying. For severe shifting problems or heavy leaks, book a proper inspection instead.
