I have a 2007 Focus 1.6 TDCI, when I accelerate harshly black soot shoots from the exhaust along with quite a bit of black smoke. At lower revs the car doesn't have any issues, a friend looked at the car and said the propeller in the turbo has too much play and it's leaking oil into air intake pipes? Can anyone share some help on the topic?

Do you give the car a good thrash from time to time? May help clean out the exhaust from soot. In terms of the turbo it might need changing however check for any error codes or if it's still able to go on boost normally. 

What your friend says sounds plausible. At lower revs the turbo isnt spinning so wont get any smoke. 

The turbo is always spinning...these even make a little boost at idle being a small turbo with VNT.

This is a classic boost leak sign tbh, looks for splits in boost pipes and cracks in the solid metal pipe.

The turbo shaft on these runs on oil rather than ball bearings, when the engine is off and there's no oil pressure, there will be some play in the turbo impellor which is totally normal.  There will also be some oil in the intake pipes from the oil breather that pipes oil mist into the intake before the turbo, that doesn't mean the turbo is faulty.

If the turbo was leaking oil from the intake side, the exhaust smoke would be blue or grey, not black.