Is Transmission Fluid the Same as Engine Oil?

[BarrettFitz]

Transmission fluid and engine oil are not the same. Transmission fluid is primarily used to keep the gear system clean, ensure the proper functioning 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 properties such as oxidation resistance, anti-wear, and corrosion prevention. In theory, both transmission fluid and engine oil serve similar functions—they are both lubricants that primarily provide lubrication, cleaning, rust prevention, and cooling. Engine oil consists of base oil and additives. The base oil is the main component of the lubricant, determining its fundamental properties, while additives compensate for and improve any shortcomings in the base oil's performance, imparting new characteristics and making them an essential part of the lubricant.