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00 00... Steering fluid fuel tank: Check oil level

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IMPORTANT: Adhere to the utmost cleanliness. Do not allow any dirt to enter the hydraulic system.
Using contaminated equipment to add fluid may introduce dirt particles into the fluid reservoir, this can significantly reduce the service life of the hydraulic steering system. Do not use any filler funnels or similar!

Visual inspection and leak test 

Check connections, hoses and steering box for traces of fluid.

Check oil level 

Check fluid level with engine switched off at expansion tank of power steering/ride height control system. The oil 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).

Fig 1: Identifying Maximum And Minimum Oil Level Marks
G04725317Courtesy of
IMPORTANT: If the oil level has dropped to the min. marking (2), you must inform the customer and 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 Reservoir Caps
G09844047Courtesy of