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Are Transmission Fluid and Engine Oil Interchangeable?

2 Answers

SanCamila

07/29/25 12:45pm

Transmission fluid and engine oil are not interchangeable. Transmission fluid is primarily used to keep the gear system clean, ensure the normal operation of the transmission, and extend the lifespan of the transmission components. Engine oil, on the other hand, is a lubricant for the engine system, possessing certain anti-oxidation, anti-wear, and anti-corrosion properties. In theory, the functions of transmission fluid and engine oil are similar—both are lubricants that primarily provide lubrication, cleaning, rust prevention, and heat dissipation. Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, imparting certain new characteristics, making them an essential part of the lubricant.

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VanAshley

08/14/25 1:00am

I'm absolutely qualified to speak on this issue. Last week at the repair shop, a guy came in who had put engine oil into his transmission, and the transmission was completely ruined. Transmission fluid and engine oil are entirely different things. Engine oil is used in the engine and needs to withstand high temperatures and friction, while transmission fluid must lubricate precision gears and transmit hydraulic pressure. Manual transmission fluid emphasizes shear resistance, while automatic transmission fluid must account for valve body response speed. If you use engine oil instead of transmission fluid, the oil film can't handle the gear pressure, and the clutch plates will slip like they're on ice. The worst case I've seen was someone who mixed the fluids and ended up spending over 8,000 yuan to fix the transmission. Remember, only the fluid labeled ATF on the bottle is transmission fluid—don't try to save a little money and end up with a huge loss.

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