How to Change Transmission Fluid

By Mister Transmission

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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Customer Reviews
Tonia was fantastic- great customer...
C M
Tonia was fantastic- great customer service
Date: March 10, 2026
Website: Google
I’ve been to Mister Transmission...
Randy G
I’ve been to Mister Transmission in Peterborough twice. The first time I had my trucks transmission, torque converter and differential fluids changed. The second time I was looking for a transmission part for an old vehicle. Both times the service was excellent and the staff were very knowledgeable and friendly. The price for the fluid change was great, they refused to take anything for the transmission part. Thank you
Date: March 10, 2026
Website: Google
Chris and his crew went...
FamousMinds
Chris and his crew went above and beyond to track down some hard to find parts for my Honda Odyssey transmission. It was a huge job with some setbacks from suppliers, but he never gave up and got the job done!
Date: March 10, 2026
Website: Google
Really good explanation by the...
Nuwan Suraweera
Really good explanation by the staff like What could be happened. What can be happen in the future. What do i need to do.Really happy about the service.
Date: March 10, 2026
Website: Google
My brother-in-law was skeptical when...
Frank Angus
My brother-in-law was skeptical when a dealer insisted our car needed a brand-new transmission and quoted a costly rebuild. Instead, he recommended Mister Transmission on Exeter Road in London to first have a look to see if they could rebuild it instead of buying a new transmission. We took his advice, and we are so glad we did. They thoroughly evaluated the car and determined the transmission was fine; the problem was something much simpler and far less expensive to fix. Their honest assessment substantially reduced the bill, and it restored our faith in finding trustworthy auto shops. Friendly, professional, and straightforward — I highly recommend Mr. Transmission, 300 Exeter Road, London.
Date: March 10, 2026
Website: Google
Julie was wonderful to deal...
Anna Halford
Julie was wonderful to deal with. She helped us tremendously to get our son’s vehicle repaired. Would definitely recommend them for future services.
Date: March 10, 2026
Website: Google
They did a great job...
Warren Pulling
They did a great job with my caravan. Great service, quick turn around. Thanks
Date: March 9, 2026
Website: Google
Got all my fluids changed...
Ahmer Zaki
Got all my fluids changed here on my Mercedes very good prices and they do an excellent job definitely coming back here and would highly recommend
Date: March 7, 2026
Website: Google
This location is the best....
Brandon Callaway
This location is the best. Chris is amazing to deal with. Had a torque converter and rear diff replaced and they did it really fast. Highly recommend these guys. 5 out of 5 stars
Date: March 7, 2026
Website: Google
Thank you, Giorgio! An honest...
Bobh Yyz
Thank you, Giorgio! An honest operator…I stopped by his Mister Transmission as a mechanic diagnosed a slow leak under my car as transmission fluid.Regardless of being tied up, Giorgio came out front to my Jeep Wrangler, crawled under, came back up, and said looks and smells like oil.He suggested the auto service shop next unit over. We went in and our explained the situation to the operator. I’m in good hands with the service shop now.Bottom line: Giorgio’s good turn, at no cost to me, quickly helped steered me in the right direction.
Date: March 6, 2026
Website: Google
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