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6 series



I am a BMW neophyte, but am gaining interest quickly.  I am looking for a 
635 Csi but don't know a lot about maintenance costs, reliability, or what 
to look for, i.e. is a FL car better than a WI car?  Is a M6 worthwhile to 
search for? Are 635s better than 633s?

I'd appreciate a reference resource? thanks