As an automotive specialist with extensive experience in the field, I'm here to provide you with accurate and helpful information regarding your query about using transmission fluid as engine oil.

First and foremost, it's crucial to understand that transmission fluid and engine oil are two distinct types of lubricants designed for specific purposes within a vehicle.
Engine oil is formulated to provide lubrication, cooling, and cleaning for the internal components of an engine. It is specifically engineered to withstand the high temperatures and pressures that are typical in an engine's operating environment.

On the other hand, transmission fluid is designed to lubricate the gears, bearings, and other components within a transmission system. It also helps to transfer power from the engine to the transmission and, subsequently, to the wheels. The formulation of transmission fluid is tailored to the needs of the transmission, which are different from those of the engine.

Using transmission fluid in place of engine oil can lead to several issues:


1. Lubrication: Transmission fluid may not provide the necessary lubrication properties that engine oil does. This can lead to increased friction and wear within the engine, potentially causing damage to critical components such as pistons, bearings, and crankshafts.


2. Viscosity: The viscosity of transmission fluid is different from that of engine oil. Engine oil must have the correct viscosity to flow effectively and provide a protective barrier between moving parts. If the viscosity is too high or too low, it can result in poor lubrication and accelerated wear.


3. Chemical Composition: The chemical composition of transmission fluid is not compatible with the materials and conditions within an engine. Over time, this can lead to chemical reactions that may cause corrosion or the formation of harmful deposits.


4. Seal Compatibility: As you've mentioned, there is a real concern that using transmission fluid in place of engine oil could lead to the blowing out of seals. This is because the different chemical properties of transmission fluid can cause the seals to degrade or fail, leading to oil leaks and potential engine damage.


5. Overfilling: If you were to mistakenly overfill your engine with transmission fluid, it could lead to an increase in pressure within the engine, which can also cause damage to seals and other components.

It's important to use the correct type of oil for your vehicle as specified by the manufacturer. Using the wrong type of lubricant can void warranties and lead to costly repairs. Always consult your vehicle's owner's manual for the recommended type of oil and the proper maintenance schedule.

In conclusion, while it may seem like a simple solution to use transmission fluid as engine oil, doing so can have serious consequences for the health and longevity of your engine. It's always best to use the appropriate lubricants for their intended purposes to ensure the optimal performance 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 >>