Hi Guys, Bit worried but yesterday i noticed when i accelerated there was a little bit of black smoke coming out of my exhaust. Not huge amounts but a little bit. Im worried i have cracked a pipe or something. Someone suggested that i fill up the car with BP ultimate and go up the motorway to clean the engine out. but apart from that any suggestions? I have a Audi 2.0TDI i only do anout 10 miles a day and hardly any motorway driving. cheers guys!