oil viscosity BMW 740IL 1999 E38 Level Control System Manual

7
Level Control Systems
Oil Reservoir
The single reservoir stores fluid for both the self-leveling and power steering systems.
Incorporated in the reservoir, is a reed type level warning switch. If the fluid level drops and
the contact closes, a signal is sent to the check control module and a warning will be dis-
played in the instrument cluster matrix display.
The hydraulic fluid required for the self-leveling suspension system varies between models
and installed equipment. The following fluid is used:
 Pentosin CHF 7.1
 Pentosin CHF 11S
 Power Steering Fluid (BMW)
This type of fluid is used because of its
low viscosity and low noise characteris-
tics. It cannot be mixed with other fluid
types.
The self-leveling system fluid type is
always marked on the top of the hydraulic
reservoir. Always use the correct fluid
never mix with another fluid.
When filling the system, be aware of the
status of the level control system. If the
vehicle is loaded, the level will appear to
be low. Do not fill the system unless it is
in the resting state. Otherwise, an over-
flow situation could result.