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The 8 Best transmission fluid additives of 2025

Are you trying to find transmission fluid additives among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling transmission fluid additives on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 18 hours of research and did 41 transmission fluid additives tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best transmission fluid additives you can buy today

SaleNo. 1
Lubegard 67010 CVT Recharge & Protect, 10 fl. oz.
  • For use in all CVT transmissions
  • Corrects and prevents problems caused by worn-out, degraded fluid
  • Reduces noise
  • Provides anti-shudder durability
  • Protects belt/chain, pulleys and other components from excessive wear
  • Reduces foaming to maintain proper fluid pressure and flow
  • Maintains belt traction
  • Lubricates and protects seals without shrinking or swelling them
No. 2
Prolong Super Lubricants PSL15000 Transmission Treatment - 8 oz.
  • Includes a Formula with Anti-Friction Metal Treatment Technology
  • Features Engineering Designed to Treat Metal Surfaces Through a Molecular and Chemical Process
  • Offers Molecules that Interact with Metal Surfaces and Chemically Bond to Create a Protective Layer that Reduces Damaging Friction and Heat
  • Offers to Treat the Metal Surfaces of Both Standard (Manual) and Automatic Transmissions
  • Features a Formula that Promotes Smoother Manual Shifts and Helps Restore Responsiveness in Automatic Transmissions
No. 3
Bar's Leaks High Mileage Transmission Repair-It, 16.9 Fl Oz
  • STOPS LEAKS, SLIPPING AND ROUGH SHIFTING: Reduces rough shifting and friction, while eliminating slip, controlling temperature, and repairing shudder, chatter and whining.
  • RESTORES PERFORMANCE: Premium high mileage formula restores transmission performance and saves on costly transmission / transaxle repairs.
  • FLUID STABILIZER: Use when topping off existing fluid when low, or add a bottle when changing the fluid.
  • SEALS CONDITIONERS: Stops leaks, slipping and rough shifting. Reduces heat & friction, and stabilizes fluid.
  • REPAIR IT: Transmission Repair-It works with all types of transmission fluids
No. 4
Bar's Leaks 1420 Transmission Stop Leak - 11 oz. , Grey
  • Stops and seals transmission fluid leaks
  • Works with all types of transmission fluids
  • Restores gasket and seals to stop transmission fluid leaks
  • item package weight: 0.81 pounds
No. 5
Lucas Oil 24 Oz. Transmission Additive - 1 Each
  • Made in United States
  • Banned in CA
No. 6
Sea Foam Trans Tune TT16, 16 oz , White
  • Specs: Trans Tune, Notes: Cleans and lubricates valve bodies, shift actuators & solenoids, Controls moisture, Dissolves and liquefies harmful gum and varnish buildup in fluid, Helps fluid systems work smoother and last longer, Helps restore shift quality by cleaning sticky varnish from valve bodies & shift solenoids, Safe for conventional and synthetic fluids, Safe in most types of automatic transmission fluid, hydraulics, or power steering fluid systems
  • Replaces OEM Numbers: Sea Foam: TT16
  • 1-year warranty protects you after your purchase. We're confident that our products will work flawlessly once installed in your vehicle. But in a rare case that it does not, we'll replace it anytime within one year of your order. If you have a problem, we will take every step to assist you, contact us for a replacement.
  • 100% New Aftermarket Trans Tune built to meet OEM specifications
SaleNo. 7
Bar's Leaks 1414 CVT Transmission Fix - 11 oz.
  • SEAL CONDITIONER: Stops current and prevents future leaks by protecting and reconditioning seals.
  • EXTREME PRESSURE / ANTI-WEAR AGENTS: Provides better metal-to-metal friction properties to stop slipping, jerking, rough shifting and shudder, improving shift feel giving better driving comfort.
  • CLEANING DETERGENTS: Includes dispersant and anti-oxidants to remove sludge and varnish from metal parts.
  • PERFORMANCE ADDITIVE BOOSTER: Controls fluid degradation caused by high temperatures, extending CVT life and reduces noise.
  • DOSAGE: One bottle treats 6 to 10 quarts of total fluid capacity. Use a half bottle for fluid capacity from 3 to 5.9 quarts. For larger systems use 1 bottle for every 8 quarts.
No. 8
zMAX Transmission Formula | Automatic Transmission and Manual Transmission Fluid Additive to Lubricate Metal and Gears | ATF Transmission Oil to Improve Shifting Performance (Pack 2)
  • PROTECT YOUR VEHICLE: zMAX Transmission Formula is easy to use! Micro-lubrication soaks into metal surfaces improving lubrication to reduce gear wear and varnish buildup. Keeps seals supple, preventing leaks and improving shifting.
  • TRANSMISSION EFFICIENCY: Improve performance by adding the formula to your transmission fluid to reduce slippage and rough shifting. Brings back smooth shifting gears resulting in an improved response. Add every time you change your transmission fluid.
  • TRANSMISSION LUBRICANT: The atf fluid cleans varnish for smoother shifting and lubricates bearings, gears, and the hydraulic system. Perfect for automatic or manual transmissions. Not for use in CVT transmissions. Does not void manufacturer's warranties.
  • ECONOMICAL PREVENTATIVE MAINTENANCE: Pour into transmission fluid to keep the gears lubricated and in top condition. The type F transmission fluid is industry tested, mechanic trusted and improves the performance and the driving experience.
  • TRUSTED QUALITY AND PERFORMANCE: zMAX is proud to be the Official Micro-lubricant of Speedway Motorsports. Trusted for over 80 years, the USA made Transmission Formula saves money at the pump and extends the engine life of all your vehicles.
No. 9
LIQUI MOLY ATF Additive | 250 ml | Oil additive | SKU: 5135
  • Prevents oil loss
  • Regenerates seals, cleans and protects
  • Improve steering characteristic and reduced the noise
  • Damps down shifting operations and protects from wear
  • Lowers repair costs and lengthens the service life
SaleNo. 10
Ford Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.
  • For use on certain limited-slip differentials to reduce chatter and hypoid gear noise levels
  • Use according to owner guide recommendations
  • Formulated for automotive use
  • Added to lubricants to reduce the surface friction of the lubricated parts

How to choose a good transmission fluid additives

Does the idea of finding a fantastic transmission fluid additives make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in transmission fluid additives. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top transmission fluid additives products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top transmission fluid additives on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top transmission fluid additives brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top transmission fluid additives based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the transmission fluid additives were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good transmission fluid additives, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your transmission fluid additives.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting transmission fluid additives for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our transmission fluid additives. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what transmission fluid additives should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on transmission fluid additives.