BMW E32 power steering and its fluid
E32 power steering: what fluid should go in it?
Pentosin CHF 7.1 (mineral-based) or CHF 11 (synthetic). The fluids must not be mixed, and ATF oil must not be used. Febi 6162 corresponds to CHF 7.1 and Febi 6161 to CHF 11. The right type can be seen from the cap marking or the owner's manual.
Why does the E32 power steering pump whine or the fluid level drop?
The most common cause is a leak: the pump seals, the banjo connection on the pressure side or a hose. The hydraulics are shared with the brakes and the level control, so the leak can also be in the level control. Wrong or old fluid causes groaning when cold. The pump must not run dry.
How is the E32 power steering fluid changed?
1. Disconnect the return hose from the reservoir into a collecting container and plug the reservoir connection. 2. Turn the steering wheel from lock to lock with the engine running and keep adding new fluid all the time. 3. Flushing takes about 2-3 litres; more in a car with level control, and the rear is raised into the air. 4. Fill the reservoir to 25 mm below the rim.