* Automatic Transmission: The transmission fluid fill location is typically on the transmission itself, often near the top. It's usually a small plug or cap. You will likely need to consult a repair manual specific to your car's year and model to locate the exact fill point. Improperly filling an automatic transmission can cause serious damage. It's best to have this procedure done by a qualified mechanic.
* Manual Transmission: Manual transmissions generally don't require regular fluid changes in the same way automatics do. If you suspect a problem with the manual transmission's fluid, consulting a repair manual or a BMW specialist is highly recommended. The filling procedure is usually done via a different port on the transmission and requires specific knowledge and tools to avoid overfilling.
Crucially, do not attempt to add transmission fluid without first consulting a repair manual specific to your 1994 BMW 530i. Improper filling can seriously damage the transmission. A repair manual will show diagrams and instructions on how to properly locate the fill point, access it, and check the fluid level (which, in many BMW transmissions, requires specific tools).
