How and When Should I Change My Transmission Fluid?

How and When Should I Change My Transmission Fluid

Transmission fluid is the lifeblood of your transmission. Transmission fluid acts as a lubricant to help keep everything running smoothly and efficiently. That is, of course, assuming that you have good levels of clean transmission fluid in your transmission. To ensure this at all times, you should regularly change your transmission fluid. But how and when is sometimes a matter of debate.

Transmission fluid

There are many transmission problems that can be caused or exacerbated by an inadequate quantity or quality of transmission fluid. If you are driving around with either very old or not enough transmission fluid (or worse still, both), you are accelerating the wear and damage on components within your transmission. Taking the time to change it out when necessary could save you loads of time and money in the end by extending the lifespan of your transmission.

When to change your transmission fluid

Just when you should change out your transmission fluid will vary depending on what kind of transmission you have, what vehicle you drive, where you drive, how you drive, and how much your drive. But for a very rough estimate, for an automatic transmission, you ought to change your fluid every 50,000-100,000 kms. 100,000 kms is in the far reaches of the acceptable range, mind you. The Automatic Transmission Rebuilders Association suggests every 50,000 kms or every two years.

For manual transmissions, you should change the fluid about every 50,000-90,000 kms, however, under intense use, some manufacturers suggest changing it as often as every 25,000 kms. The reason for the difference between automatic and manual transmissions is because they take different fluids. Automatic transmissions take –get this– automatic transmission fluid. For manuals, it is a bit more complicated. They might take any of a variety of oils: regular motor oil, heavyweight hypoid gear oil, or even automatic transmission fluid in some cases. Your owner’s manual will tell you which is best for your transmission.

How to change your transmission fluid

To change out your transmission fluid, first let your car idle for a few minutes. After turning your ignition off, raise and secure the vehicle. Lay down at least a two-gallon catch pan, then carefully remove the bolts from one side of the transmission pan and then the other bolts, allowing the pan to tilt and drain. Once you’ve removed all the bolts, lower the pan and dump the remaining fluid into the catch pan.

After that, remove the old transmission filter and O-ring. The filter contains fluid, so keep the drain pan underneath. Install the new transmission filter, and make sure that the O-ring is in the appropriate place. Attach the new gasket to the pan with oil-soluble grease – not gasket sealer or adhesive.

Screw in all the fasteners finger-tight. Torque the pan bolts to spec in a spiral pattern starting at the center. Maximum torque is often about 12 pounds per foot. Then, lower your automobile and fill the transmission with the recommended amount of fluid. Finally, turn your engine on to check for leaks.

Contact us

As you can see, changing your transmission fluid is quite involved. If it seems like much of a hassle for you, please contact us at Mister Transmission and we’d be happy to do it for you. We can also “flush” your transmission fluid out, taking out more metal shavings and debris.

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
Julie is the best service...
Ali Abdullah
Julie is the best service lady ive dealt with. Customer service and their techs are top notch! Diagnosed my transmission free of charge
Date: September 15, 2026
Website: Google
Multiple vehicles, multiple visits -...
Chad Heron
Multiple vehicles, multiple visits - the team have proven their weight in gold. Highly recommend this establishment.
Date: September 15, 2026
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To fix the tranny of...
Victor S
To fix the tranny of my old car was expected of him because he is running the same Mister Transmission place for decades. But what wasn’t expected of him to tune my 40 yr old car to perfection, and fix my leaky carburetor. Changing the upper arms and wheel bearings were also extra. So if you look for something more than just your transmission, I doubt you can find a better mechanic than Kenny at Mister Transmission on Woodbine at Dennison. You’ll be seriously satisfied, and more than pleasantly impressed!
Date: September 15, 2026
Website: Google
I had an issue with...
Drew Smith
I had an issue with my subaru, and was given limited options in stratford to fix it. I took it to Gary and his team, and not only did he give me options for repair, he was very straightforward and thorough with his explanation on the problem and the best way to solve it. I would highly recommend anyone with transmission issues to take it here, even if only for a second opinion
Date: September 14, 2026
Website: Google
Professional and thorough service. Provided...
Kael MacNeil
Professional and thorough service. Provided me with a full transmission rebuild after a critical failure with any and all issues covered under a 20,000km warranty. Gave me an excellent deal on cost and went the extra mile finishing up some small projects I was working on under the car at no added cost.
Date: September 14, 2026
Website: Google
I would recommend Mister Transmission...
Tyler Sheppard
I would recommend Mister Transmission amazing service
Date: September 14, 2026
Website: Google
Great customer service at fair...
EJG
Great customer service at fair cost. They finished the work quickly at the price I was quoted. 10/10
Date: September 13, 2026
Website: Google
Great customer service at fair...
EJG
Great customer service at fair cost. They finished the work quickly at the price I was quoted. 10/10
Date: September 13, 2026
Website: Google
Great customer service at fair...
EJG
Great customer service at fair cost. They finished the work quickly at the price I was quoted. 10/10
Date: September 13, 2026
Website: Google
My first mistake was to...
ED Glez
My first mistake was to bring my Truck to the dealer for a Transmission oil change, they really screwed up, should have taken to the Experts the first time , Mister Transmission listen to the issue and gave me my options, and lucky me they got it right away. Super professional, they won a new Customer and I will advise them to all my friends and family. Thanks to Ray and Gus.
Date: September 12, 2026
Website: Google
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