Hi, I just bought a Ford Fiesta .18 turbo diesel 2002 to start my new job. I had it serviced where the mechanic changed all the fluids and topped them up. The car smoked quite a biut when i got it (only 2 weeks ago) The mechanics put some solution it the diesel tank that seems to have cleared the smoking a bit...but it still smokes when started...seems to be less smoky when driven for a while.( white smoke). Seems to have problem starting the car when its cold. I am not too knowledgeable about cars...I have been reading a lot but would like some advice. Fuel filter was changed during servicing.

Help please..

Thanks.
Bongoman