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im ahve been in contact with a ex bmw tech,,he now has his own place and he will be servicing my 335d gearbox/vac lines removal of swirls etc,,he has told me the vortex filter is just that now,,it has not got a loo roll or a cartridge,,but he says i should fit a loo roll breather as the swirls and dpf are getting sorted..he did say it was just a matter of precaution and peace of mind,,but for the cost ill get it done..
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