The factory transmission oil cooler on your 1999-2005 BMWE46 is a liquid-to-liquid cooling unit, utilizing the engine's cooling system to cool the transmission fluid during warm outside temperatures and warm the fluid during cold outside temperatures. Though these designs are tried and true, they eventually wear out and fail, leading to leaking coolant into your transmission fluid. Mixing coolant into your transmission fluid can have catastrophic results, and can cost thousands of dollars in rebuilding or replacing the transmission.---- The Mishimoto Replacement Transmission Oil Cooler is a direct fit to the OEM, making it easy-to- install and is equivalent to the OEM Specifications of performance. This product requires no modifications and is backed by Mishshmoto’s Lifetime warranty. Replace your transmission cooler and prevent premature failure.

This Part Fits:

Year	Make	Model	Submodel
2000	BMW	323Ci	Base
1999-2000	BMW	323i	Base
2001-2006	BMW	325Ci	Base
2001-2005	BMW	325i	Base
2001-2005	BMW	325xi	Base
2000	BMW	328Ci	Base
1999-2000	BMW	328i	Base
2001-2006	BMW	330Ci	Base
2001-2005	BMW	330i	Base
2001-2005	BMW	330xi	Base
2001-2006	BMW	M3	Base
2004-2005	BMW	X3	2.5i
2004-2006	BMW	X3	3.0i
2003-2005	BMW	Z4	2.5i
2003-2005	BMW	Z4	3.0i