You can check the fluid on an auto. There is a fill plug. With the car level, the fluid should be at the top of the fill plug. They can also be repaired, just hard to find someone to do it. Most people want to change with rebuild unit. easier and more money for them.
1995 325I, tinted windows, K&N, debaffled air box, BMW style #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 style heated mirrors, various interior bits, Bosal cat-back