BMW Genuine Fuel Tank Breather Valve with Breather Line for 525i 530i X3 2.5i X3 3.0i E60 E83 Fuel Tank Breather Valve with Breather Line BMW part# 13 90 7 557 923, check fit below. Genuine BMW part, recently made: not been lying around. NOTE: 525i and 530i fit m54 engine only. NOTE: X3 fits 2.5i and 3.oi only.