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AFAIK, all E9x have vortex breather filters.
Earlier E6x (pre LCi??) had loo roll type, which obviously caused problems.
BMW then decreed that the breather filter should be changed every 3rd oil change (along with the air filter). The part number for the loo roll and vortex type are the same.
Also, I understand that the E9x had the "later", larger spindles fitted. My late '04 E60 530d had the larger spindles, but earlier E6x had smaller ones - IIRC the shaft diameter was increased by 0.5mm.
Mike
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