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Your cart is empty.Cerma STM-3 Automatic Transmission will restore fast smooth shifting, while giving you protection unmatched by any other product sold anywhere! Cerma STM-3 for Transmissions utilizes our SiC technology to form a micro-ceramic protective coating on all metal parts within your vehicle's transmission or gear box. This will not allow the formation of performance degrading sludge and varnish to form. Simple one-time application, add to vehicle and go! Cerma STM-3 for Transmissions: Restores performance and fixes many transmission issues Stops slippage, hesitation and rough shifting in worn transmissions Eliminates most seal leaks and lowers operating temperatures in hard-working units Ideal for all uses including auto, diesel truck, motor homes and commercial vehicles Excellent for preventative maintenance and extends fluid life by up to four times Extends needed protection to planetary gears
William H. Mahns
Reviewed in the United States on January 23, 2025
Too expensiveDid not notice improvement
janice
Reviewed in the United States on August 19, 2023
After a the post I fell for it !This stuff can't help a transmission I spent $6000.00 cause it just needed to be replacedDon't take the chance
Jason
Reviewed in the United States on June 4, 2023
Always been skeptical of using car products like these and their claims. I keep up with my maintenance on my vehicles, so was just adding this as an added benefit. Put this into my 2014 Nissan Rogue that has a CVT transmission. Noticed how much smoother the transmission shifted and also how much more quiet it was, Even with me having had the CVT transmsisison fluid changed only a month earlier. Also noticed a dramatic horsepower increase as well as miles per gallon after adding this to my transmission.
Syned
Reviewed in Canada on October 8, 2023
J’ai dû payer $28,22 de douanes et frais de manutention pour en prendre possession. Désagréable car non mentionné.
Dennis Parr
Reviewed in the United States on July 24, 2021
I looked at this product as a shot in the dark. I received it on July 20, and followed the directions. I drove for 20 minutes and the shifting improved somewhat. Today is july 24, I drove for over a hour with no problems at all. I`m glad I took a chance on your product.
Kymco Rider
Reviewed in the United States on January 7, 2021
Worked great on my coworkers old Kia minivan with 223k and it was shifting hard. It smoothed it out.This also smoothed out our 2018 Crosstrek with 82k and yes with a CVT . The tranny always surged slightly at low speed with the A/C on, now it rides smooth at all speeds. We also used the engine treatment in a 20 year old Malibu with 312k as we bought it and found it knocked when cold with a bad main bearing. After about 800 miles with the treatment the knock noise in the engine main bearing was gone and vibration too. This stuff works great!
Tim Stafford
Reviewed in the United States on January 4, 2019
After basically a full week of driving over 100 miles per day I have no change in how smooth the vehicle shifts. All gears feel the same. Nothing is broken the car throws no codes to even a dealers PCM tester. I opted to get all new tires yesterday and that helped more than anything but the companies claims it smoothes out shifting is not correct. At this point with the miles I've put on the vehicle a change should have been felt. I wouldn't buy it again. I've had a $5 product work better than this has...Update: I'm over 3000 miles now and still no improvement in smoother shifting. However, the company did give a refund for the transmission treatment so at least they stand behind the product.
john
Reviewed in the United States on August 27, 2018
I added this on a car that was having problems shifting in the city especially when cold. After adding Cerma my gas mileage went down by 2-3 miles a gallon. Not a lot but enough to have paid for itself within 5000 miles. Not many repairs can claim that. The first shift of the day can rougher than the rest but that seems to be more easily recognized because the rest of the shifting is so seamless. Shifting of gears is also much faster. When warm you can hardly notice. When I go into passing gear on a steep hill my Subaru used to make a bang. Now most of the time it is silent but if it does make a noise it is much quieter than this and the other 2 Subarus I have owned. I have had it in for 3 months now and it only seems to get better. I am installing it in other relatives because I like it that much. A+++ the engine treatment is great also.
Michael Csincsa
Reviewed in Canada on May 23, 2018
Works!!
Alex
Reviewed in Canada on January 14, 2018
Great product 👍👍
freddie1122
Reviewed in the United States on September 7, 2014
Please don't waste your money on this product. As for the 100% money back guarantee it isn't worth a thing. The guarantee states that if you are dissatisfied for ANY reason they will refund your full purchase price. I got in touch with them and they told me that the vehicle needs to be driven for 3000 miles in order for the product to work and since it would be impossible to drive that many miles in the allotted 90 day time frame we are screwed either way. Also on the web site it doesn't say anything about driving X amount of miles in order for it to work. The money back guarantee was the only reason I thought I would give it a try. After 2 months of driving with the stuff in the transmission the shifting didn't get one bit better and had to end up at the shop where they fixed the transmission.
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