The automatic transmission is an intricate part including the manufacturing of its components in a precision way that necessitates regular checks on its fluid and maintenance after the recommended periods. It's important to inspect for potential fluid leaks at gaskets, seals, and promptly fix them. If the transmission is run with insufficient fluids it may lead to destructive mechanical problems which can be prevented through proper maintenance as maintaining a transmission is much cheaper than buying new ones. In such cases, one should consider exchange transmissions offered by local dealerships who often give warranties along with some credit towards failed transmission as a core. These exchange transmissions also save time compared to disassembling and diagnosing a failed transmission. Due to being complicated, requiring special tools and high-cost replacement alternatives, it's advisable to consult knowledgeable BMW service facility for services as well routine checks on models without dipsticks. Different types of BMW vehicles require different types of transmition fluids hence it is important to follow manufacturer's recommendations regarding what kind of liquid they should use. While checking fluid levels, temperature plays a crucial role hence specific ranges are given for various transmission types. Various symptoms of over filled or under filled transmissions are listed while recommended transmissions fluids for different models are supplied too. E30 AND E36 MODELS: Checking Fluid Levels And Changes Include Drainage and Refilling Transmission As Well As Servicing The Transmission Plan And Filter.