How do you refill transmission oil in BMW 325i?

Answer 1

Since you are asking this question I am assuming you have the 5 speed manual transmission.

Selection of transmission oil is crucial with these cars. If you have the stock Getrag 260 transmission use SAE 80 API GL-4 non hypoid gear oil. The capacity is about 1.3 quarts.

The transmission fill plug is on the passenger side of the transmission. The drain plug is on the bottom. They are Allen plugs, usually 17mm. To refill the oil take the car on a little spin so the old oil will be warmer and thinner. Jack the car up but keep it level. This means using 4 jackstands. Take out the fill plug ( the top one ) off first. Then remove the lower one; have a pan in place to catch the old oil. Let it drain for as long as it takes for there to be no more oil draining from the lower plug. Replace the lower (drain) plug and torque it between 40 and 60 nm ( 30 - 44 ftlbs). Using a pump ( available at parts stores ) to pump in the transmission oil into the fill hole until the oil start to run out. Allow the oil to run out until it stops; the level should be right at the bottom of the fill hole. Replace the fill plug and torque to the same specs as the drain plug.