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
First meet Steve thru Marks...
Sean Byrne
First meet Steve thru Marks transmissionShop,,Had my F150 routine service ,,Steve and the guys and gals there r Honest and true to there word, and don't push unneeded work to b done , Thx to all there ,, ps Happy Retirement to Cambell
Date: August 10, 2026
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Brought in my 2014 F-150...
Colin
Brought in my 2014 F-150 with a transmission concern. Kris and the team were upfront about what was needed and what wasn't, and completed the repair cleanly and professionally. After 30+ days of varied driving including cold starts and extended sits, pulling trailer, city driving, the truck is shifting perfectly. Honest shop, fair price, no unnecessary upsells. Highly recommend Kris and the team at Mister Transmission. There is a reason this shop is so busy!
Date: August 10, 2026
Website: Google
We broke down in the...
Nikki Maronese
We broke down in the Sault as we were traveling through -We were stranded! Mr. Transmission moved some things around to get us in. He ended up staying late on a Friday and coming in on a saturday so we would be able to head home. Great service, excellent communication and overall great place.
Date: August 10, 2026
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Best experience I've had in...
Mags B
Best experience I've had in a shop in a long time, they were incredibly nice, explained to me the problem (worn cable, something was seized), and had my car in and out in a half hour. Absolutely incredible service, I will be telling anyone and everyone who needs transmission work to go to this Mr Transmission.
Date: August 10, 2026
Website: Google
3 tries to get an...
Catee “Catee
3 tries to get an appointment (Automated booking cannot be trusted, the next booking was rescheduled due to parts not in on time). I went to my dealership for another matter and asked about parts for MrT. They arrived the week before but nothing was ordered specifically for me. When I called MrT, Sara said she meant to call last week but got busy. She didn’t call me the next business day either so I recommend you call them to keep on top of things:) Other than that, service was good, fluid and filter changed, pan inspected. I dropped off my vehicle night before and it was ready after lunch the next day.
Date: August 10, 2026
Website: Google
Excellent service, provided updates and...
Luke Hanneman
Excellent service, provided updates and were very straightforward, would go back.
Date: August 10, 2026
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Mr T is great, Ken...
Travis Mercer
Mr T is great, Ken is a solid person to take your car to, Chris is good as well.
Date: August 9, 2026
Website: Google
I was recently camping north...
Mike Leo
I was recently camping north of the soo when my truck broke down ( tranny trouble ) before the truck was towed i phoned mr T and told them my problem - they said bring it in early next morn and we'll look at it - tow dropped truck off and they took it right away - couple hours later i was on my way back to my site - thanks to the Devons for all your help - great service and shop
Date: August 8, 2026
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⭐⭐⭐⭐⭐ Huge thank you to...
Michael Frankovich
⭐⭐⭐⭐⭐ Huge thank you to Aki and the entire team at Mister Transmission! We brought our truck in with transmission issues, and these guys did an absolutely amazing job. Aki was professional, knowledgeable, straightforward, and kept everything clear throughout the process. The transmission was repaired properly, and the quality of their work exceeded our expectations. Team of this place is so professional guys ! It’s not easy to find a shop you can truly trust, especially when it comes to major transmission work, but Aki and his team definitely earned our trust. Highly recommended from the entire Smart Roads team. Thank you again, guys — excellent work!
Date: August 7, 2026
Website: Google
Theses guys are awesome, I...
VeganSupply
Theses guys are awesome, I came in with my RHD car, even though it was outside their specialty they were completely honest and extremely helpful getting me to the next step after they found my issue. Owner stayed late to make sure my car was safely stored and looked at the very next morning to help me get on my way. Highly recommend this company, honestly and extra care go along way and tons of respect for these wonderful folks here!
Date: August 7, 2026
Website: Google
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