Power steering reservoirs hold the extra fluid needed to run your steering unit. If your car starts making noises when you turn the wheel check this reservoir to make sure it is filled to its proper level. If yours is getting old, drying out or cracking make sure to replace it with a new one from Pelican Parts.
Reservoir with Cap - Power Steering Fluid
318i (1992-98), 318is (1992-97) 318ti and M3 (1995-99), 323i and 323is (1998-99) 325i and 325is (1992-95), 328i and 328is (1996-99)