As a mechanical expert with extensive experience in automotive maintenance and repair, I understand the importance of using the correct fluids for the proper functioning of a vehicle. It is a serious mistake to put transmission fluid in the engine oil, and it can lead to severe consequences if not addressed immediately.

Firstly, it's crucial to understand the differences between transmission fluid and engine oil. Engine oil is designed to provide lubrication, cooling, and cleaning for the engine's internal components. It reduces friction, dissipates heat, and prevents corrosion. On the other hand, transmission fluid is formulated to lubricate the gears, bearings, and other moving parts of the transmission system. It also helps to transfer power from the engine to the transmission.

When you mistakenly add transmission fluid to the engine oil, several issues can arise:


1. Incorrect Viscosity: Transmission fluid is typically thicker than engine oil. This increased viscosity can lead to poor circulation within the engine, which can cause overheating and increased wear on engine components.


2. Lubrication Issues: The additives in transmission fluid are not the same as those in engine oil. The engine requires specific additives to prevent corrosion, foaming, and oxidation. Transmission fluid lacks these additives, which can lead to poor lubrication and increased wear.


3. Seal Damage: As mentioned, transmission fluid can be thicker than engine oil. This can cause excessive pressure within the engine, leading to the failure of seals and gaskets, which can result in leaks.


4. Engine Damage: Over time, running the engine with the wrong fluid can lead to significant damage. The lack of proper lubrication can cause components to seize, and the increased heat can lead to warping or other forms of damage.

If you have mistakenly put transmission fluid in the engine oil, here are the steps you should take immediately:


1. Stop the Engine: If the engine is running, turn it off immediately to prevent further damage.


2. Drain the Fluid: As soon as possible, drain the engine oil and transmission fluid. This should be done by a professional to ensure that all the fluid is removed and to prevent any cross-contamination.


3. Clean the System: After draining the fluids, the engine and transmission systems should be thoroughly cleaned to remove any residue of the incorrect fluid.


4. Refill with Correct Fluids: Once the systems are clean, refill the engine with the correct engine oil and the transmission with the appropriate transmission fluid.


5. Monitor the Engine: After refilling with the correct fluids, monitor the engine closely for any signs of abnormal behavior, such as excessive noise, smoke, or poor performance.


6. Professional Inspection: It's highly recommended to have a professional mechanic inspect the engine and transmission to ensure that no damage has occurred and that everything is functioning properly.

In conclusion, putting transmission fluid in the engine oil is a serious mistake that can lead to significant engine damage. It is essential to address this issue immediately by draining and cleaning the systems and refilling with the correct fluids. Always consult with a professional mechanic to ensure the safety and longevity of your vehicle.

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The transmission fluid will not be providing exactly what the engine needs in order to be properly lubricated and you could be causing your engine damage by continuing to run it with the tranny fluid in there. As you've suggested, there is a real chance of blowing out seals due to having too much fluid in the engine.Mar 27, 2017read more >>