How and When Should I Change My Transmission Fluid?

By Mister Transmission

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.

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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!
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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 the service and friendly staff. Price for the work was very reasonable.
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They fixed my van in a professional manner and super fast thanks for your services
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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
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Richard Waroway
Chis and team always look after you.
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Jim Stone
Quick service, great prices, great staff!!!!
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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
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Dan, was a great employee....
Nick Luxon
Dan, was a great employee. Very transparent with the service. Exceptional job.
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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
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