I picked up a used Mk5 Golf from a local trader a couple of months ago, which came with a 3 month 'MBI warranty on engine and gearbox'. While getting some work done last week, I was told that from the sound of the engine on startup it was likely my timing chain/tensioner had gone and would need replacing. I don't really have much experience with used car warranties. Is this sort of thing going to be covered? And if so, am I likely to face a fuss?