Coolant Expansion Tank, Rein - E39 525i 528i 530i 1999-2003

This part is listed by BMW as BMW part number 17111436381 (17-11-1-436-381) and is described as Coolant Expansion Tank for 5 series 6 cylinder, 1999-2003 including 525i 528i and 530i. This expansion tank can be used on these models during the years 1999, 2000, 2001, 2002 and 2003.This is an OEM E39 expansion tank manufactured by Rein Automotive (CRP) - an original supplier to BMW for many components and systems. As an OEM it 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.

It is very common for this expansion tank to get brittle and crack over time, leaking coolant, causing overheating, and potentially stranding you on the side of the road. The constant hot/cold temperatures and positive pressure of the cooling system stress the plastic until eventually a crack develops. If you are replacing any other part of the cooling system in the E39 5 series 6 cylinder, we suggest inspecting and replacing this tank as a preventative measure. 

For questions or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.

BMW Fitments:

5 Series
E39 (97-03) > 525i
E39 (97-03) > 528i 97-98
E39 (97-03) > 528i 99-00
E39 (97-03) > 530i