Why Is It Necessary To Change Your Transmission Fluid?

March 10, 2021 | By Mister Transmission

Why Is It Necessary To Change Your Transmission Fluid?

Do you really have to change your transmission fluid or is it just one of those things that you’re supposed to do. We hate to tell you, but, yes, you do have to change your transmission fluid at some point to ensure a properly functioning transmission.

What Is Transmission Fluid?

Your transmission fluid is the lifeblood of your transmission. Most Canadians drive automatic transmission vehicles, which require automatic transmission fluid to lubricate the components within the transmission and it also acts as a coolant. Continuously variable transmissions (CVTs) also use transmission fluid. Manual transmissions vary. Some use transmission fluid, some use something called transmission oil, and some use standard motor oil. Automatic transmission fluid is optimized for automatic transmissions, but all these fluids provide lubrication.

What Problems Might You See With Your Transmission Fluid?

Checking your transmission fluid every month gives you the best chance of catching small problems before they grow big. But what are you checking for? First, check your fluid levels. If your fluid isn’t at the line, top it up. If you have to top it up every month, you probably have a leak, and your transmission needs to be resealed. But also check the quality for your transmission fluid. It should be mostly clear with a reddish hue (or in some rare cases, greenish). If your fluid is opaque or if it smells bad, then this is indicative of a larger problem. Apart from whatever other repair is necessary, your transmission fluid will need to be changed.

Do You Only Need To Change Your Transmission Fluid When There Are Problems?

If your transmission overheats, it can burn your transmission fluid. Burnt transmission fluid needs to be changed. To check your transmission, a tech might perform a pan examination, in which they will check your fluid for particulate matter. Some material in your fluid is normal, but there shouldn’t be a lot of it. Friction surfaces often wear down and, if left alone for too long, they’ll contaminate your fluid to levels that are too high. Then your fluid will have to be changed.

All these issues that require transmission fluid changes start somewhere else. But do you need to change your transmission fluid just as a precaution? Some manufacturers offer “fill-for-life” fluids and some transmissions are designed to be complete systems in which nothing goes in or out. But claiming something doesn’t make it true. No matter what kind of automatic transmission you drive, what kind of fluid you use, or where you drive, the Automatic Transmission Rebuilders Association recommends a transmission fluid change every 50,000 kms, or every two years.

Mister Transmission

To learn more about transmission fluid changes, please contact us.

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Customer Reviews
This St. Margaret location was...
Lee Bee
This St. Margaret location was awesome. They found my rear engine leak in next to no time at all. And took care of a few other random repairs too. Even though they're are a transmission shop, they went above and beyond for me and my repairs which im so appreciative of. I will be recommending them to anyone who asks. No wonder they've been in business so long. Great work!
Date: March 2, 2026
Website: Google
Mr Transmission on Upper James...
Jessica McDonald
Mr Transmission on Upper James is the only shop I trust for repairs on my vehicle. Justin and his team are friendly, knowledgeable, efficient and always make the effort to go above and beyond.
Date: March 2, 2026
Website: Google
Great experience!! They were very...
Mackenzie Marcus
Great experience!! They were very kind and super accommodating to my busy work schedule offering to stay late for me to pick up my car. They explained everything in detail and never made me feel bad for not knowing anything about cars. Would absolutely recommend!!
Date: March 1, 2026
Website: Google
Fast, friendly and efficient service....
Brian
Fast, friendly and efficient service. Unusual problem but they knew about it and did the necessary repairs; at a reasonable price. And a courtesy car as well!
Date: February 28, 2026
Website: Google
I Bring all my Vehicles...
Ryan Asplund
I Bring all my Vehicles here for maintenance work these guys are top notch! Very knowledgeable staffing and it’s locally owned and operated so can’t beat that!! Thank you!!
Date: February 28, 2026
Website: Google
Fast, friendly and efficient service....
Brian
Fast, friendly and efficient service. Unusual problem but they knew about it and did the necessary repairs; at a reasonable price. And a courtesy car as well!
Date: February 28, 2026
Website: Google
Fast, friendly and efficient service....
Brian
Fast, friendly and efficient service. Unusual problem but they knew about it and did the necessary repairs; at a reasonable price. And a courtesy car as well!
Date: February 28, 2026
Website: Google
Free diagnosed for the car,...
SP SPARK
Free diagnosed for the car, Perfect, I love their service and their job.They will provide with everything that is necessary for your vehicle and for Customer Service
Date: February 27, 2026
Website: Google
Blair and his team at...
Kevin Hnatiuk
Blair and his team at this location seem to be the go-to for known and unknown transmission types and were recommended by another mechanic shop. For example, I needed to replace a transmission on a 2003 Right-Hand-Drive (RHD) Hybrid Toyota Estima I imported and they were able to swap it out. I appreciated that someone in the city was willing to get creative and not turn me away because it wasn't part of a pricing template.During a more recent visit, I needed a diagnostic for a Used Nissan Pathfinder I had purchased and requested a CVT fluid change. The diagnostic returned a faulty Mass Air Flow sensor. The front desk (Darren) went with an OEM sensor ($600) versus one of the $200 sensors you find on Amazon and his rationale for doing so seemed sound as many of the reviews showed that oversea-sourced sensors from Amazon fail within a year.Perhaps I'm of a more curious nature than most, and I have plenty of questions about the work being performed, what's being used, and the condition of the fluids being removed. I appreciate when shops help me understand their rationale. Darren is a pleasant-enough fellow, however, I did not feel on my last visit that we were in sync when I was seeking information on the condition of my transmission and fluids. At one point I was told that, "Curiosity killed the cat," which I found an odd response to a straightforward question. I'll chalk it up as a misunderstanding. My advice to this location is that a little information goes a long way to reassuring the customer. If Darren had been a bit more curious about the work being performed, I would have felt in a better position to say it was money well spent. My vehicle doesn't drive or perform any different since having the sensor and CVT fluid changed, so in my case, I would have welcomed a confident accounting of the condition of the fluids and work. Dare I suggest photos as some of the other shops are now doing. I'm glad we have Blair and his mechanics here in the city doing the work they do. My suggestion for improvement is that they modernize some of their process and systems (eg. photos on file) so that customers like myself can feel reassured throughout the interaction and beyond.
Date: February 27, 2026
Website: Google
Great service, very transparent pricing....
Prasanthan Krish
Great service, very transparent pricing. They kept me in the loop through the entire process with updates, got my transmission rebuilt in about a week. Warranty was the big reason I went with them.
Date: February 27, 2026
Website: Google
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