What Happens If You Put Transmission Fluid In The Oil?

People keep asking what would happen if they put transmission fluid in the oil. So in this article, we will be talking about the effects of putting transmission fluid in the oil. Let us start.

So what happens if you put transmission fluid in the oil? Nothing significant will happen if you just put a little bit of fluid in the oil. It will not cause significant problems.

However, many people would say, why would you put transmission fluid in the oil? The transmission fluid has a different purpose in the engine of the vehicle. This is why it has a different name. 

That is why it is not named engine oil. This article will talk about the effects of having transmission fluid in the oil. But you are not supposed to look for transmission fluid on any parts except in the transmission parts. 

So again, there is nothing much if you put a small amount of transmission fluid on the oil. The base oil of the transmission fluid is just the same as the engine oil. This reason will not cause you so much trouble. 

You have to make sure about tiny little details to avoid dangers. If you put a small amount of transmission fluid, you did not mix engine oil. You have to make sure that the transmission fluid is the same type of engine oil that you are using in your vehicle. 

One thing is that people used to believe that the fluid is a great cleaning agent. So for an oil change, they tend to use transmission fluid in keeping everything clean.

What Happens If You Put Transmission Fluid In The Oil

Can You Put Transmission Fluid In The Oil?

Well, you can if you want to. It will not hurt anything if you put transmission fluid in your engine. It might even help a little bit. The crankcase will be filled with too much fluid, which is not a good thing. In the engine, the motor oil is made to work. 

On the other hand, the transmission fluid is made for the steering and gear systems of the vehicle. These two fluids have similarities.

What Happens If You Accidentally Put Transmission Fluid In The Oil?

For the transmission fluid to be correctly lubricated, it will not give the engine the proper amount necessary for the lubrication. You can also damage the engine if you use a tranny fluid. Having too much fluid in the engine will cause the seals to blow out. 

This should not cause any significant damage to your engine. Many old-time mechanics are used to putting tranny fluid in their engine to clean it out before doing an oil change. 

Can I Mix Transmission Fluid With Oil?

If you mix different types of oils and grease, it can cause a malfunction in the machinery. If you mix lubricants, it is not recommended. The engine oil and the transmission fluid are different because the engine oil is a lubricant and the transmission fluid is a hydraulic fluid. 

They are the same liquids, but they have different properties. Therefore, they are used differently also.

Can You Mix Used Oil And Transmission Fluid?

You can if you want to. The difference between the engine oil and the transmission fluid is that the engine oil is a lubricant and the transmission fluid is a hydraulic fluid. So they are the same liquids but have different properties, and they are also used for different jobs.

How Do I Remove Transmission Fluid From My Engine?

Here are steps in removing the transmission fluid. You can do it all by yourself. 

Step 1: The transmission fluid will drain better in operating temperatures; you have to let your vehicle idle for a few minutes. Turn your ignition off, raise and then secure the vehicle. 

After that, lay down a tarp, some cardboard, or a newspaper. Take off the bolts from one side of the transmission.

Step 2: Carefully loosen the bolts. This will allow the pan to tilt and begin to drain. 

If the bolts are removed, lower the pan and put the remaining fluid into the catch pan. Then, slowly break the gasket seal with a screwdriver. 

Step 3: Take off the old transmission filter and the O-ring. The filter has a fluid and keeps the drain path below.

Step 4: Put and install the new transmission filter and ensure that the O-ring seats are in the appropriate orifice.

Step 5: Put and connect the new gasket to the pan using an oil-soluble grease and not a gasket sealer or adhesive

Step 6: Refer to the service manual in using thread sealer or any transmission pan bolts. Screw all the fasteners. Torque the pan bolt. 

Lower the car and fill the transmission with the recommended amount of fluid. After, start the vehicle, warm it up and then shut it off. If there are any leaks, run the vehicle up to the operating temperature.

Will Transmission Fluid Clean An Engine?

The automatic transmission fluid has detergents, and it helps in fighting sludge. Some people will add a small amount before the motor oil changes. 

It is a way to clean accumulated deposits and then dissolve sludge. However, the ATF is not formulated for use in automotive engines, and they should not replace a traditional engine flush or cleaning product for many reasons.


In summary, many people are asking what would happen if they transmitted fluid in the oil. If you put in only a tiny amount, it does not cause significant damage to your engine. 

This is because they are almost the same liquid. However, a lot of people still prefer not to mix them.

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Image credits – Canva

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My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more