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This is the replacement for the troublesome oil filter profile gasket on the M50, S50US, M52, S52, M52TU, M54, and S54 engines. The housing is separate from the engine block and in between there is this small profile gasket. The gasket shrinks over time which allows oil to seep out. On S54 engines (E46 M3, MZ3, Z4 M) there is a flanged head bolt going into the cylinder head, behind the thermostat cover. This holds the left side timing chain guide rail in place and if it's loose or falls out you could have a very serious engine failure to deal with. Make sure to check this bolt while you're replacing the oil filter housing seal. You only need to make sure it's tight. But if it's come loose you may want to replace the seal ring and use a small touch of oil-resistant thread sealer. Fitment : For BMW 1998 Z3 3.2 L6 E36 For BMW 1998 328i M52 E36 For BMW 1992 320i For BMW 1994-1995 320i For BMW 2001-2004 320i For BMW 1996-1999 328is E36 For BMW 2000 328Ci E46 For BMW 1997-1998 Z3 2.8 L6 For BMW 1996-2000 328i E36 For BMW 1998-2000 323i E36 For BMW 1998-1999 323is E36 For BMW 2003-2005 Z4 E85 For BMW 2006-2008 Z4 3.2 L6 For BMW 2001-2005 330i E46 For BMW 1994-1995 325i E36 For BMW 2001-2005 325i E46 For BMW 2001-2005 530i E39 For BMW 2001-2006 X5 3.0i E53 For BMW 1997-2000 528i E39 For BMW 2004-2006 X3 E83 For BMW 2001-2005 325xi E46 For BMW 1999-2002 Z3 E36 For BMW 2001-2006 330Ci E46 For BMW 1992-1993 325i E36