How to Change Transmission Fluid

Determining the frequency of transmission fluid and filter changes hinges on many factors

Transmission fluid: it is the lifeblood of your transmission. Without it, your vehicle would cease to run. You need to have the transmission fluid and filter changed at recommended intervals as per your vehicle’s owner’s manual, and a transmission flush ought to be performed at least once every three years.

Transmission fluids serve three purposes: it serves as the hydraulic element within the transmission regulating gear changes, it keeps the transmission clean and lubricated, and it cools the entire transmission system.

There is a lot of friction happening within the transmission. These mechanisms are designed to work with the full capacity of transmission fluid. If the levels drop, that friction is less productive and more damaging. Over time, heat will break the fluid down and be unable to lubricate the system effectively. That puts pressure on the transmission to work harder to pump fluid through the filter.

Checking Your Transmission Fluid Level

If you are experiencing performance issues with your vehicle, you may wish to check your car’s transmission fluid level. But be advised: checking your transmission fluid level can be risky as you need to keep the engine running.

Moreover, in some modern vehicles, it is no longer possible for the average motorist to perform a transmission fluid check. It is advisable to have trained, experienced transmission technician inspect your transmission and the quality of the fluid in it.

Though your vehicle’s owner’s manual will make recommendations as to the required frequency of changing the transmission fluid and filter, you should also weigh the type of driving you do, and the environment where you drive. If you have high mileage on your vehicle, drive in mountainous or hilly terrain, regularly tow a trailer or boat, or if you’re hauling heavy loads, have your transmission inspected annually.

Preventative Maintenance Is Your Best Protection

Although there are no guarantees you can avoid a transmission failure no matter how well you treat your vehicle, you can reduce the risk of a transmission malfunction by ensuring preventative maintenance is performed regularly by a professional.

For more than 50 years, Mister Transmission has kept Canadian motorists on the road by ensuring the transmissions in their vehicles are in tip-top shape. If you have a question about your transmission or want to book a service appointment, contact the Mister Transmission service centre nearest to you.

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Mister Transmission Team

The Mister Transmission team consists of certified transmission specialists with decades of combined experience in diagnosing, repairing, and maintaining automatic and manual transmissions.

With over 60 years of service across Canada, our experts provide trusted, accurate, and up-to-date automotive advice to help drivers make informed decisions about their vehicles.

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Customer Reviews
No issues, good customer service
Peter Preston
No issues, good customer service
Date: June 27, 2026
Website: Google
Amazing place, was super helpful...
Arun
Amazing place, was super helpful from the get go
Date: June 27, 2026
Website: Google
They communicated frequently about the...
Kim Masur
They communicated frequently about the progress with our vehicle. They were also able to accommodate us when our issue happened after they closed. Very appreciative of their service! Thank yo
Date: June 27, 2026
Website: Google
Awesome service, awesome staff, just...
Joyce DesRoches
Awesome service, awesome staff, just all around awesome
Date: June 26, 2026
Website: Google
Great job, on time and...
Geoff Moore
Great job, on time and great people to work with.
Date: June 26, 2026
Website: Google
I had been to other...
Leio Shek
I had been to other shops before coming to Mr. Transmission, and every time I got upsold on expensive services that did absolutely nothing for my car. It was frustrating and costly. Ken was completely different. He quickly diagnosed the real issue, changed the transfer case oil, and now my car runs incredibly smooth — night and day difference. No pressure, no nonsense, just honest, quality service. If you want someone who actually knows what they're doing and won't waste your money, this is the place. Highly recommend!
Date: June 26, 2026
Website: Google
They are so nice and...
Kim Weese
They are so nice and do a good job
Date: June 26, 2026
Website: Google
I had a great experience...
Beatrice Perri
I had a great experience with Mister Transmission on Dixie Road. The customer service was outstanding from start to finish. Service Advisor Sel was excellent. I was having some issues with my vehicle, and he took the time to clearly explain the problem and the steps the team was taking to ensure it was properly resolved. He kept me informed throughout the process, which gave me confidence that my vehicle was in good hands. Manager Aki also went above and beyond by contacting me a few days later to check on how the vehicle was performing after the repair. That follow-up showed they genuinely care about their customers and stand behind their work. If you're looking for honest, professional service with great communication, I highly recommend Mr. Transmission on Dixie Road. Sel and Aki are a fantastic team!
Date: June 26, 2026
Website: Google
Took my F-150 in for...
Austin Kovacs
Took my F-150 in for what I thought was a leak between the transmission and transfer case. They inspected it, found both fluids were only slightly low, topped them up, and honestly recommended leaving it alone instead of pushing unnecessary repairs. They didn't even charge me. It's refreshing to find a mechanic that genuinely puts their customers first. Highly recommend, and they'll be my go-to shop for future work.
Date: June 26, 2026
Website: Google
I had a major issue...
Tin
I had a major issue with my transmission and they have been so great with dealing with it. The first solution fixed it for a while then it came up again and they fixed it for free again. They actually care about you and keeping your business. Would recommend
Date: June 26, 2026
Website: Google
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