Forte / Wynns diesel cleaner

[akhlaq768]

On the odd occasion when I start the car, there is a black smoke coming from the exhaust. And also I notice it when the turbo kicks in (when putting the foot down).

Never used the diesel cleaners before, just wondering which brand you guys recommend, or is there something better in the market.

I'm getting the car serviced this weekend, and though I try this also.

Thanks,