Transmission Fluid

How Often Should You Change Your Transmission Fluid

Good question. How often should you change your transmission fluid? How important is this routine maintenance? Yes I said routine. Transmissions are the driving force behind making your vehicle travel down the road and neglecting it can put your wallet in a tail spin. Transmissions are made up of clutches, discs, solenoids (in today’s automobiles) and a filter.

Neglecting it not only will send you looking for alternate transportation in the short term, but the costly repair bills could cause a phone call to your credit card lender. All of this can be avoided by simple routine maintenance. I am an advocate of Preventative Maintenance and it has been a large part of my mechanical career in just about every position I have held working as a mechanic at various employers, to include my own business.

Let’s talk about the makeup of the transmission, no not the kind we put on our faces, but the nuts and bolts of it. Automatic transmissions are made up of Clutch plates, discs, hydraulic fluid (automatic transmission Fluid ATF) and a filter. Newer vehicles are manufactured with electronic solenoids which are operated by your cars computer system. They operate the shifting portions in the transmission.

Transmission fluid is like engine oil, if it is not changed during its regular maintenance intervals, in time it loses its ability to lubricate and create friction. When the lubrication has diminished, the clutch plates and discs begin to wear prematurely causing it to fail. Once it begins down the road of failure, there is no saving it other than a costly rebuilding. For my customers, keeping them traveling down the road and less time in my shop is the key to happy customers. The following picture is the burnt fluid being removed from my friends transmission.camry draining

When your cars transmission fluid should be changed:

Check your owner’s manual; you know the book that never seems to make it out of the glove compartment, for the service intervals or by asking your mechanic. Many manufactures recommend 30,000 miles, others reference longer periods. If you own a vehicle with over 150,000 miles, I would recommend replacing it a little sooner.

Recently a friend contacted me with some power issues on his 1998 Camry and possibly suspected the transmission. My first question to her was, when did you change your transmission fluid last? With the extent of silence on the phone, which I think he was trying to think back, the answer was, I have no idea. Right then and there I knew it at least needed to be inspected. She brought over the Camry and I pulled the transmission dip stick, here is what I saw.

The red arrow indicates what the fluid looked like when I pulled out the dip stick to check the fluid color and level. As you can see it is very dark in color indicating that the transmission fluid has lost its ability to perform properly and the fluid is burnt. The purple arrow indicates what the color of the transmission fluid should look like. I immediately placed the vehicle on the lift and removed the old fluid, removed the pan to check for metal fragments. If the transmission is begining to fail, there will be signs indicating a failure by how much metal is in the pan. In this case, there were no fragments present. I replaced the filter, removed all of the old transmission fluid left in the transmission, reinstalled the pan and added new pink fluid. Now will be the test of time to see if any harm was done. Many times when you service the transmission after the fluid has lost it capabilities, it could fail. It is always a crap shoot at this point. I instructed my friend to drive the vehicle and I guarantee if any damage was done, it will not be long before it will let leave you stranded.Transmission Fluid


The moral to this story is, remember to always perform the required routine maintenance on all your vehicles and they will give you miles of driving pleasure.



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4 Responses

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  1. Mia Evans
    Jan 02, 2024 - 11:23 PM

    It got me when you said that neglecting the transmissions will require us to use a different transportation option. I do not want that to happen when my schedule becomes more hectic this year. So I should make sure to take my vehicle to a transmission shop to get it checked and have maintenance tasks done to it as well as have other components checked and fixed if there are issues.

  2. Liam butler
    Jul 12, 2018 - 06:07 AM

    Skipping the transmission oil change could have significant impact on the performance of the transmission. Different components of the transmission needs lubricant for the reduction of friction among them. However, due to the generation of extreme temperature transmission fluid degrades and loses it’s specific physical and chemical property and could not lubricate different components of the transmission and could cause breakdown of the transmission. So, it is really necessary to inspect the condition of transmission oil and if necessary replace it in time. Abnormal behaviors of the transmission should be addressed immediately. You may like to visit:

  3. Jesse maxwell
    May 10, 2018 - 04:07 AM

    Thank you for sharing such a nice and useful article. Transmission plays crucial role in the performance of the vehicle and needs regular maintenance to ensure smoother and secure performance of the vehicle. Transmission oil acts as a lubricant and reduces friction among different components of the transmission to ensure smoother performance of the transmission and degrades in time and needs to be replaced with suitable substitutes. So, the quality and quantity of transmission oil along with other fluids used in the vehicle needs to be inspected at a regular interval and damaged components should be replaced with suitable substitutes for better results.

  4. Click Here
    Dec 23, 2017 - 09:04 PM

    Thanks very nice blog!


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