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
Christine and Chris, hands down...
Donna Travers
Christine and Chris, hands down best customer service, customers are treated like family. Talking to Chrisine on the phone, she knows her transmissions. Trustworthy, Knowledgeable and efficient. Can't say enough about this shop. Something to be said for small towns and family run buissness!
Date: January 11, 2026
Website: Google
I was referred there by...
David Patterson
I was referred there by my friend who works for Peel Regional Police and he told me that's where they fix their cars. Great service and a good job. They rebuilt my 2017 Rogue transmission after other places told me they couldn't do it and dealer wanted crazy money. These guys saved me money and it’s been 3 weeks and it works like when it was new. I will recommend Mister Transmission.
Date: January 11, 2026
Website: Google
Very knowledgeable and kind, great...
Eduard Makkai
Very knowledgeable and kind, great service.
Date: January 9, 2026
Website: Google
Mister Transmission immediately welcomed and...
Haley Girard
Mister Transmission immediately welcomed and reassured me from my very first phone call. Everyone was incredibly friendly, explained everything thoroughly, and made sure I knew there were options for repairs, which meant a lot to me. A special shoutout to Julie for her amazing customer service and for being so incredibly helpful throughout the entire process. She truly went above and beyond. They noticed multiple issues with my vehicle very quickly, things that previous shops never mentioned. Other shops kept giving me vague “maybe” fixes, but Mister Transmission was straightforward, honest, and thorough, covering all the bases without any pressure or scare tactics. Within two days, my truck was fixed and running amazing. I went in thinking I needed a whole new transmission, and thankfully that wasn’t the case at all. I will absolutely be returning for future work and will be making them my go-to shop for repairs. I’ll also be recommending them to anyone I can. Thank you all so much for your amazing work, it’s genuinely appreciated. I’m no longer scared to drive my vehicle!
Date: January 9, 2026
Website: Google
Chris, Wes and the team...
Sean McIlveen
Chris, Wes and the team are efficient and honest. Worth coming by if you have CVT issues with your ride!
Date: January 9, 2026
Website: Google
great shop - great employees...
Penny Barr
great shop - great employees and manager! So easy to deal with!
Date: January 9, 2026
Website: Google
I had my Toyota Corolla's...
Timothy The
I had my Toyota Corolla's CVT replaced at this shop a few months ago. Thanks to Cecil & Chris for giving me good deal. They're definitely reliable & trustworthy. My car is running well now.
Date: January 9, 2026
Website: Google
Best customer service, great honest...
Ghalibfine Art
Best customer service, great honest team.i came from far to get my car check.owner is so honest. He gave perfect feedback.you are best I wish would have known about you before my envoy Gmc would have been with me.i had bad experience with car experience before.thank you Sir u are the best of best
Date: January 8, 2026
Website: Google
Friendly and honest service. Nice...
John Evans
Friendly and honest service. Nice to see these days fully recommend
Date: January 8, 2026
Website: Google
I have never met anyone...
Har Kaur
I have never met anyone so honest and professional. I came all the way from caledonia .he never charged single cent,and gave honest answer about my car engine, that there is nothing wrong with transmission. I m very thankful to you sir,world would be so beautiful with honest people like you
Date: January 8, 2026
Website: Google
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