Focus 2.0 Zetec 2001 White Smoke

Good evening
I bought a Focus 2.0 a month ago, and when I bought it I was with the full oil storage, the other day I went to check it and it is in the minimum, it is 1000 km from the next oil change (so the windshield stipker says), another thing is that it takes white smoke when it is moderating and when I accelerate it a lot.
Alguen can tell me that it can be happening for this to happen
in the automotive that bought it have told me that it has 3 months or 3000km of guarantee in the gearbox and in the engine.
Thanks for your comments

From what you say, it seems to be some valve or slack retain in the valve guides for wear. Hit the spark plugs to see if you have any that burn oil and give you a track of what are the guides and stamps that you have to check in that cylinder. The seals or stamps may not be disassembled to change them, but to see the slack in the guides if, with which they must open the engine and also take advantage of seeing if there is no scratch inside the cylinders due to breakage of some segment (this is also a possible cause of burning oil). Hay luck ... greetings!