Hiya I've had years of Audi ownership but just got a 1.8t (AJL engine) I'm a proper green newbie when it comes to this engine and it's my first turbo car so I certainly know stuff all. I've read a bit on the sludge problem and am now paranoid as hell my engine is about to die a horrible death. It's got full service history but the oils not been changed at 5k all the time and I think it's also been on a 'Long Life' service schedule (whatever the hell that is...) Is there a way to tell of any impending doom on the horizon? The inside of the filler cap has some hard black (what looks like) carbon built up on it...Should I be worrying?? Si.