Only had mine just over 2 weeks, car has the Das welt warranty (2014 model) took into dealers last week and they couldn’t find anything, rattles aren’t covered though - seems worse when cold or 1st thing in morning - oh and a £65 diagnostic charge for the pleasure - however the supplying dealer kindly paid that.
Never had a car that has rattled so much from rear - we do live down at the end of an old concrete lane that’s pretty poor but my wife’s and daughters cars are nice & quiet - even my old Jeep Patriot wasn’t this bad.
Do the bilsteins make a massive difference?
Cheers
Phil