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zMAX 51-306 - Transmission Formula - for Automatic and Manual Transmissions - Reduces Carbon Build-Up - Lubricates Metal and Gears - Keeps Seals Supple - Improves Shifting Performance - 6 oz.

4.6 4.6 out of 5 stars 728 ratings

$16.99
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Purchase options and add-ons

  • 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: Cleans varnish for smoother shifting and lubricates bearings, gears, and the hydraulic system. Perfect for both 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 eco-friendly formula 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.
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This item: zMAX 51-306 - Transmission Formula - for Automatic and Manual Transmissions - Reduces Carbon Build-Up - Lubricates Metal and Gears - Keeps Seals Supple - Improves Shifting Performance - 6 oz.
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Product Description

Close-up of zMAX Transmission Formula bottle with visible product details.
Transmission system infographic detailing how zMAX improves gear lubrication
Zmax

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zMAX 51-306 - Transmission Formula - for Automatic and Manual Transmissions - Reduces Carbon Build-Up - Lubricates Metal and Gears - Keeps Seals Supple - Improves Shifting Performance - 6 oz.


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What's in the box

  • zMAX 51-306 - Transmission Formula - for Automatic and Manual Transmissions - Reduces Carbon Build-Up - Lubricates Metal and Gears - Keeps Seals Supple - Improves Shifting Performance - 6 oz.
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    Price$16.99-42% $9.90
    List:$16.99
    $29.99$44.99$17.61
    Delivery
    Get it as soon as Thursday, Jan 9
    Get it as soon as Thursday, Jan 9
    Get it as soon as Thursday, Jan 9
    Get it as soon as Thursday, Jan 9
    Customer Ratings
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    Customer reviews

    4.6 out of 5 stars
    728 global ratings

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    Customers say

    Customers find the auto accessory effective and providing good value for money. They mention it works well with most engines, improves shifting quality, and provides smoother shifting and better pickup. Many customers find it a proven product that extends transmission life and improves performance.

    AI-generated from the text of customer reviews

    68 customers mention "Functionality"68 positive0 negative

    Customers like the product's functionality. They say it works well, runs smoothly, and improves powertrain performance. It works with most engines and stops whining noises in the rear end. The results are almost immediate, with better mileage and improved shift points.

    "...So i did a flush and the transmission improved 90%...." Read more

    "Bought vehicle used and had set barely used for about a year, ran great but transmission seemed to have to warm up to kick in, added this and seems..." Read more

    "Helps to slick up transmission to send more revolutions to the wheels . Helps smooth out transmission...." Read more

    "...it runs better!" Read more

    43 customers mention "Shifting quality"36 positive7 negative

    Customers appreciate the smoother shifting quality after using the auto accessory. They find it improves shift firmness and ease of shifting, lubricating seals. The accessory helps reduce friction and improve pickup and go.

    "...added this and seems to have lubricanted the seals and improved ease of shifting and driving." Read more

    "...It is so much smoother and the downshifts are not nearly as abrupt, in fact I'd call them enjoyable. Best $17 I've spent on the car beyond a doubt...." Read more

    "...Helps smooth out transmission. I have been using zmax for years and have only had good results like the engine runs about 15 degrees cooler." Read more

    "After adding Z-Max transmission fluid to my Lexus it began to shift smoother and quicker than before...." Read more

    12 customers mention "Value for money"12 positive0 negative

    Customers appreciate the value for money of the auto accessory. They say it's a great product for a good price, provides cheap maintenance, and is the best trans product for Hondas.

    "...Best $17 I've spent on the car beyond a doubt. I highly recommend this product." Read more

    "Zmax products are awesome, I was excited to get the transmission formula as I was having some funky shifts happening in my Mustang's Transmission...." Read more

    "Great product good price point for what it does!!" Read more

    "Best trans product for Hondas works great!" Read more

    7 customers mention "Quality"7 positive0 negative

    Customers are satisfied with the auto accessory's quality. They say it's a proven product that has been thoroughly tested and works extremely hard daily. The accessory offers good performance and longevity, requiring less maintenance and repairs.

    "...In 4 different vehicles. I truly believe I have less repair. my car starts and runs great. I think I get better mileage too." Read more

    "Proven product, preserves transmission reliability, keeps seals reliable from leaking." Read more

    "...100% no B.S. just good quality products!!" Read more

    "...max are great a little extra insurance when chasing horse power and longevity." Read more

    5 customers mention "Mileage"5 positive0 negative

    Customers like the mileage. They say the car runs smoother and gets better mileage. It extends the life of the transmission and provides more power and smoothness.

    "...The results were almost immediate. The car runs smooth and gets better mileage. My best mistake." Read more

    "...my car starts and runs great. I think I get better mileage too." Read more

    "...I applied it in my 1988 Toyota 4x4 Pickup and the result is more power and smoothness in the mechanical transmission box ... Excellent ..." Read more

    "Thoroughly tested and worked extremely hard daily, running tens of thousands of miles yearly!..." Read more

    Always use it and continue to use it Zmax for life
    5 out of 5 stars
    Always use it and continue to use it Zmax for life
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    Top reviews from the United States

    • Reviewed in the United States on July 15, 2021
      Size: Pack 1Verified Purchase
      We have a 2014 GMC Acadia with around 109k miles. We purchased it used and when i got it i noticed the trans fluid had yet to be replaced. So i did a flush and the transmission improved 90%. However, 1 to 2 and 2 to 3 was a little hard shifting, not bad but i knew it shifted smoother than what it was doing. So i got ZMAX which ive used before in my oil, but never in a transmission. Needless to say it cleaned the shift points up perfectly. After driving around for about 30 min it was already shifting snoother. After my wife drove it back and forth to work for a couple days its now like new. Super happy with this product. This is not a product thats going to fix mechanical issues. But i believed my issue was just a varnish issue around the solenoid actuators where the oil had not been replaced. GM recommends every 40k miles on trans oil. So yeah if your having a little harder shifts then your used too. Get this and it will clean it up. You dont need to pull any oil out, just add the product and drive, its that simple. In about 1000 miles the product will fully soak in to all the metal and clean and lubricate varnish points. This product is not designed to fix worn out trans parts. So dont bother because it will leave a bad taste in your mouth. It simply soaks into the metal, allowing varnish or carbon to not adhere to the metal services. Look into Prolong or Bestline products if you need to treat a worn out transmission.
      10 people found this helpful
      Report
    • Reviewed in the United States on June 3, 2024
      Size: Pack 1Verified Purchase
      Bought vehicle used and had set barely used for about a year, ran great but transmission seemed to have to warm up to kick in, added this and seems to have lubricanted the seals and improved ease of shifting and driving.
      One person found this helpful
      Report
    • Reviewed in the United States on December 14, 2024
      Size: Pack 1Verified Purchase
      I have a 2016 Taurus SHO with about 80k miles on it. I drive it hard and it does not disappoint but the shifting has always been hard since I bought it at about 30k miles. Not broken hard or a problem but I always wished it would be smoother especially on the downshifting when slowing down. I added this on a whim about a 100 miles after a transmission flush and am so glad I did. I noticed an immediate (within 20 miles) change in the shifting for the better. It is so much smoother and the downshifts are not nearly as abrupt, in fact I'd call them enjoyable. Best $17 I've spent on the car beyond a doubt. I highly recommend this product.
    • Reviewed in the United States on February 3, 2021
      Size: Pack 1Verified Purchase
      I can't say this formula cured my transmission problems long-term, but it helped get rid of an engine code and made my car shift a little quieter. It's super thin (like water) which surprised me
    • Reviewed in the United States on April 22, 2024
      Size: Pack 1Verified Purchase
      Helps to slick up transmission to send more revolutions to the wheels . Helps smooth out transmission. I have been using zmax for years and have only had good results like the engine runs about 15 degrees cooler.
      One person found this helpful
      Report
    • Reviewed in the United States on October 10, 2024
      Size: Pack 1Verified Purchase
      I would recommend it to all of my friends
    • Reviewed in the United States on March 20, 2024
      Size: Pack 1Verified Purchase
      Bought a used car transmission fluid was never changed. Added this and all my shifting issues that was making the car sluggish worked changed the transmission fluid first!
      One person found this helpful
      Report
    • Reviewed in the United States on July 27, 2024
      Size: Pack 1Verified Purchase
      I purchased this for added protection from expensive transmission repairs shifts smoothly

    Top reviews from other countries

    • marctbo
      5.0 out of 5 stars All Zmax additives are #1
      Reviewed in Canada on February 8, 2024
      Size: Pack 2Verified Purchase
      I use Zmax engine, trany and fuel additives all the time in my 2012 Dodge Ram with the Hemi which has over 264,000km on it! And this Hemi still runs and performs great! I've been using Zmax for years for all my vehicles and it has never let me down! My vehicles run forever! I add these additives every 2nd or 3rd oil change...I add every 2nd oil change since it rolled over 250,000km! This stuff doesn't just coat the metal like all other additives, it soaks into the metal which makes it last longer and run smoother!