This part is listed by BMW as BMW part number 17217559960 and is described as Power Steering Cooler for the E60 525i, 528i, 530i, 545i and the 2004-2005 E63 and E64 645CI without active steering.
This is the fluid cooler used in the power steering system. BMW calls it a radiator or a loop. The cooler runs fluid from the steering rack back to the reservoir and is exposed to airflow to cool the fluid. Leaks here are uncommon unless the pipes have been damaged by debris or corrosion.
This is a power steering cooler manufactured by Mahle Behr (previously Hella Behr), an original supplier to BMW for many engine components. As an OEM, Mahle/Behr meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
BMW Fitments:
5 Series
E60 / E61 (04-10) > 525i M54 (2004-2005)
E60 / E61 (04-10) > 525i N52 (2006-2007)
E60 / E61 (04-10) > 525xi N52 (2006-2007)
E60 / E61 (04-10) > 528i
E60 / E61 (04-10) > 528xi
E60 / E61 (04-10) > 530i M54 (2004-2005)
E60 / E61 (04-10) > 530i N52 (2006-2007)
E60 / E61 (04-10) > 530xi N52 (2006-2007)
E60 / E61 (04-10) > 545i
6 Series
E63 / E64 (04-10) > 645Ci