2001 BMW 325 Transmission Oil

It is a life time filled transmission and does not require checking unless there has been leakage or if serviced. Having said that the fluid level is correct if you remove the filler plug located on the right side of the transmission towards the rear, it takes an 8mm Allen wrench, with the engine running, on level ground, between 30-50 degrees C and top off until it runs out. It takes a special fluid, regular ATF wont work. You may wish to leave this operation to a trained professional.