Our Coolant Expansion Tank is a replacement part for your aged, cracked, or otherwise deformed coolant expansion tank. Replaces BMW part # 17117573781 (17-11-7-573-781). Cap and level sensor sold separately.
This is an OEM expansion tank for any non-M model E46, X5 3.0 liter (E53) and first-gen X3 (E83), made by either Behr-Hella or Rein. These are our preferred brands for this expansion tank, for quality, longevity and price. Both brands have supplied BMW with original parts for decades, and these are what we choose for our own BimmerWorld owns BMWs, including company project cars, service repair shop work, and employee owned E46 models.
This expansion tank is found on 323i, 323Ci, 323iT, 325i, 325xi, 325Ci, 325iT, 325xiT, 328i, 328Ci, 330i, 330xi, 330Ci and 330i/Ci ZHP models, as offeredin the 1999, 2000, 2001, 2002, 2003, 2004, 2005, and 2006 model years. This is also found on all 2001-2006 X5 3.0 liter as well as all 2004-2010 model (first generation) BMW X3 (E83 chassis) including X3 2.5i, X3 3.0i and X3 3.0si.
The recommended replacement interval on the coolant expansion tank on the E46/E53/E83 is 100,000 miles. We feel if you have over 100k miles on your coolant expansion tank, you are on very borrowed time - with a failure likely eminent. When the expansion tank fails, it will crack, leak coolant, cause overheating, and leave you stranded on the side of the road. Don't let this happen to your E46!
E46 (99-05) > 320i
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
E83 X3 (04-10) > X3 2.5i M54 (2004-2005)
E83 X3 (04-10) > X3 3.0i M54 (2004-2006)
E83 X3 (04-10) > X3 3.0si N52 (2007-2010)
E53 X5 (00-06) > X5 3.0i M54