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If you have a leak from the expansion tank, this small o-ring may be the source (but not the obvious source). This 19.3x2.4mm o-ring seals the coolant level sensor in the expansion tank.
This is a o-ring manufactured by Rein (CRP) Automotive - the original supplier to BMW for this part, as well as many other seals and gaskets. As the 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.
BMW Fitments:
3 Series
E36 (92-99) > 323ic
E36 (92-99) > 323is
E36 (92-99) > 328i
E36 (92-99) > 328ic
E36 (92-99) > 328is
E36 (92-99) > M3 (96-99)
5 Series
E34 (89-95) > 525i M20
5 Series
E39 (97-03) > 528i 97-98
E39 (97-03) > 540i
8 Series
E31 (91-97) > 850Ci
$1.99
Coolant Level Sensor O-Ring, CRP - E36 323i/325i/328i/M3, E34 525i, E39 528i/540i
O-ring to seal the level sensor in the expansion tank. OEM-type replacement for BMW part #61311361249.
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