A8 3.0 Tdi V6 ( 2006 )

[FrankA8]

Hi there, 

Im new member here. 

I own an A8 3.0 Tdi 2006 year and i would like to have some help to understand better my engine. 

Its a V6 engine so i need to know if i need to change every X miles the ignition coils and if the model has fitted DPF. 

Since recently the car starts to smoke ( dark grey/blackish) and is been done a service just 20 miles ago but still smoke when the car get hot. 

Is anyone can recommend me what to do and how can fix the issue. 

Regards

FRANK