Checking fluid level

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Check fluid level with engine switched off at expansion tank of power steering/ride-height control system. The fluid temperature should be approx. 20°C here.

Ensure that the cap is fully screwed in prior to the fill level check.

If necessary, add hydraulic fluid up to Max. marking (1) (refer to OPERATING FLUIDS )

Fig 1: Identifying Power Steering Expansion Tank Max And Min Marking

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: If the fluid level has dropped to the Min. marking (2), you must check the power steering and ride-height control for leaks and issue a separate invoice for this work.
It is not enough merely to top up the fluid.

NOTE: To avoid mix-ups when filling with hydraulic fluid, mark the fluid reservoirs or their caps with identification marks.
ATF Automatic transmission fluid
CHF Pentosin CHF11S

Fig 2: Identifying Fluid Reservoirs Caps With Identification Marks

Courtesy of BMW OF NORTH AMERICA, INC.