zMAX51-306 - Transmission Formula - for Automatic and Manual Transmissions - Reduces Carbon Build-Up - Lubricates Metal and Gears - Keeps Seals Supple - Improves Shifting Performance - 6 oz.

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.

Put it in the wife's Xterra with out telling her, and the next day she came home from work and said what did you do to the car? it runs better!

This really works one time I had a oil change the person forgot to put oil back in my truck. I when home with it all of a sudden the oil light came on. I pull over NO oil ! So I got oil and my engine was still perfect.

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

This doesn’t stop leaks 1st and foremost lol, but it’s top tier additive, I put this in mostly all of my transmissions usually once every couple of years with a 5 to 6qt fluid replacement

My work Van was shifting very hard. I was worried about it going out on me. I put this stuff in and now it just slips into gear smooth as a baby's bottom. Highly recommend this product!!!!

ZMax products are a must for all my vehicles! Make sure you follow all directions and your vehicle will thank you!

I used this 5yrs ago it gave my truck another 2 yrs of life and it was slipping real bad drove it for about 30 miles and the slipping started to disappear real quick . I just put in my current truck and it did the same thing great product.