have you seen the plugs at 60,000KM??? their **** house... the VW branded plugs are just NGK's anyway... if your keen enough/confident.. do your own plugs around 60k or just say you dont want them done at 60.. its completly up to you.. the service adviser will strongly suggest you do have them done at the recommened service interval and if you dont want to void any warranties just do them.. thats my thought on it.