you was spot on the oil filter it was well fl u ked , only had first service 500 miles ago , is was a faulty filter , went redline ktm today got my self oil and new filter , asked them there if there was faulty filters and got told yes , so got new one in and changed oil and defo better , ,IF KTM NO THAT THE FILTERS WERE FAULTY ,, I think ktm should realy ring round ktm duke buyers and get the faulty ones out and sorted before engines go bang , so if u had a service last year its worth getting filter for 12 quid and just swopping it out to make sure
Thanks for the info on faulty filters
ive got pics of the old one but not sure how to put on ere ,ill put it on facebook thow under superduke forum