Engine oil in a normal car is pumped around the engine to lube all the moving parts.
Electric cars don’t have an engine so they don’t need engine oil.
Transmission fluid in a normal car is used to lubricate the gears and to act as hydraulic fluid to actuate the moving parts in the transmission.
Electric cars are usually a single fixed gear ratio so they don’t have a transmission.
The one oil that electric cars DO have is usually gear oil in the drive unit. The fixed gears still need lubrication and for single-motor axles the differential needs lubrication too. Typically this oil will last the life of the vehicle because it’s not exposed to extreme heat, combustion products or friction material from a transmission, but you could technically change it if you wanted to.
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