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assuning there is nothing major wrong, get some forte injector and use it as recommended. I once had a renault laguna diesel fail an MOT test, a roadworthiness test that is, on emissions...it was absolutely chucking out black smoke but the engine ran well. I put 2 bottles of injector cleaner in the half full tank and went out for an eighty mile drive revving the engine in the lower gears. I returned to the testing station an hour and a half later and the engine was running perfectly.
Alternatively, assuming the engine runs well but is just a little smokey, have it terracleaned, this will remove most of the carbon deposits from the engine/exhaust and should increase the life of your engine simultaneously improving fuel economy
biggest cause of loss of power on this model is the accelerator pedal module ,what happens is the car runs ok then just loses power stop and turn it off then restart and it runs ok again for a while ,time between slow downs can vary depending driving conditions.
first thing to check is oil level. some diesels will use some oil. if this is real heavy soot and moisture, it could be the fuel distributor/pump going out. how does it run? if its running poorly, this could be your answer. check the valve adjustment(lash) for proper adjustment also.
Black smoke usually means a rich mixture. For some reason the car is getting too much fuel. If the check engine light is on then take it to a shop with a code reader. They can tell you what sensor needs replacing. These newer cars are usually totally computer controled so if a sensor goes bad they will adjust the mixture incorrectly.