When I rev the engine while the car is sitting on my drive (by blipping the throttle) I see some black stuff (which I presume is soot) coming out of the exhausts and I wonder if this is normal. If I blip it hard then the amount of black is more than if I blip it more gently - it is like a puff of black smoke. If I press the accelerator gently to build up the revs then there is no black stuff at all.
Last Saturday I drove to Wiltshire and back, so a lot of fast motorway driving of around 200 miles. Then during this last week I have done five days of a mile to the station in the morning and a mile back in the evening. I read that this is bad for the DPF, and so I took the Audi advice and did a 15 minute each way run up the motorway with the gearbox in Sport mode and with the revs at between 2,500 and 3,000 rpm, to regenerate the DPF.
Having got back home I still see some soot when I blip the throttle to rev the engine, the same as described above. Is it normal to see some soot when you do this?
The other thing to mention is that I have a Chipped UK Fast Road remap loaded. If the soot is normal then that is fine. If I shouldn't see anything black when revving the car then I will remove the map and put the original back and speak to Chipped UK.
Thanks for any advice.