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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This location at 5890 dixie...
Ann Perkins
This location at 5890 dixie rd. Has one of the best tranny expert I have ever dealt with, he diagnosed the problem and had me out of there in less than 2 hrs. Great prices compared to anyone else as I had called around. Thanks to aki and his great team for fitting me into your schedule. I am so grateful!
Date: May 13, 2026
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Thank you Mohamed and your...
Adam M
Thank you Mohamed and your team for the professional service, and I’m so happy now with my car thank.
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I was quite pleased with...
Brian Acott
I was quite pleased with the service and friendly staff. Price for the work was very reasonable.
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They fixed my van in...
Mehdi
They fixed my van in a professional manner and super fast thanks for your services
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First of all I want...
Charles H
First of all I want to say this is my second time at this location and the professionalism and customer service here is amazing Dan is so informable and knowledgeable about what he does the first time I was there for computer for my ford focus my second time back now I needed the clutch this time and they had my clutch done in 2 days no bs or anything extra and even gave me a ride home and being a senior citizen I was very grateful will definitely be back for any work I might need and would highly recommend anyone they definitely go above and beyond for their customers and fair pricing
Date: May 12, 2026
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Chis and team always look...
Richard Waroway
Chis and team always look after you.
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Quick service, great prices, great...
Jim Stone
Quick service, great prices, great staff!!!!
Date: May 12, 2026
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My vehicle totally shut down...
Arlene Peever
My vehicle totally shut down on Hwy 115 and the only display message was service transmission so I had it towed to Mr Transmission in Peterborough. Turns out that it was not the transmission after being on the diagnostic machine for hours but electrical. Joe then had it towed to the GMC dealership in Lindsay where they determined it to be the fuse block and electrical module. Fixed and then brought back to Peterborough. Definitely went above and beyond for me. Would highly recommend. Sincerely, Arlene
Date: May 12, 2026
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Dan, was a great employee....
Nick Luxon
Dan, was a great employee. Very transparent with the service. Exceptional job.
Date: May 12, 2026
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Aki and his team of...
F W
Aki and his team of professionals repaired the differential fluid leak from the broken seal on the rear axle quickly and at a reasonable cost. They showed me the possible issues that could arise from doing the repair and the possible additional costs. They performed the service on the spot and as originally diagnosed. Thanks for the great work.
Date: May 12, 2026
Website: Google
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