Our research indicates that your vehicle does not have a transmission fluid dipstick. These types of transmissions are designed to be maintenance free. In order to add transmission fluid, your vehicle likely has check valve on the bottom of the transmission on the bottom of your car. Your car must be level when the fluid is checked and we therefore recommend having a mechanic with a hydraulic lift or underground bay check your transmission fluid.
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This video shows you how to add transmission fluid to your 2002 BMW 325i. Before adding transmission fluid, make sure that your engine was running when you checked the fluid level. If the transmission fluid level on your 325i is low, you need to add fluid through the dipstick tube. BMW has been developed sophisticated transmissions through years and it is critical that you add the exact type of transmission fluid stipulated by your owner's manual (typically in the back of the manual in a section titled Fluid Capacities.) When adding transmission fluid to your 325i, be sure to add it slowly as the transmission fluid capacity is reached quickly and it is difficult to remove excess fluid if you overfill.
If you are having problems with the transmission in your 325i, such as clunky shifting or hesitation, check the fluid level first - it is amazing how many drivers pay thousands of dollars for transmission work when a half quart of transmission fluid would have fixed the problem.
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