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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:
5 Series
E34 (89-95) > 530i
E34 (89-95) > 540i
5 Series
E39 (97-03) > 540i
7 Series
E32 (88-94) > 740i
E32 (88-94) > 740iL
7 Series
E38 (95-01) > 740i
E38 (95-01) > 740iL
E38 (95-01) > 750iL
8 Series
E31 (91-97) > 840Ci
E31 (91-97) > 850CSi
E31 (91-97) > 850Ci
X5 Series
E53 X5 (00-06) > X5 4.4i M62 4.4L (99-03)
E53 X5 (00-06) > X5 4.6is M62
$2.99
Thermostat O-Ring, CRP - E39 540i, E38 740i/iL/750iL, E31 840ci/850i, E53 X5 4.4/4.6is M62/M62TU
O-ring to seal the level sensor in the expansion tank. OEM-type replacement for BMW part #61311361249.
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