Ill do that, how do I go about getting the codes checked? If it is misfiring what am I looking at to fix it? Sorry about the questions but Im new to BMWs.

My local AotoZone pulls codes for free and gives a print-out. Then I think I've seen a link here somewhere that shows what they are .... Although I never had AutoZone pull codes on my X, only on my wife's Volvo. Hope they can do it on BMW as well.

They can pull the codes on a bimmer no problem. I still do not think its your alternator. You'd have other electrical gemlins happening... its something else.

What oil filter did you use?