berlingo 1.9 DW8 engine smokes and eats its own oil on corners?

hi there , i went to pick a v reg berlingo up today and when ticking over its a bit lumpy and smoky , then when i drove it home it seamed to clear up the smoke , 80 mph on motorway ok , no smoke , but on going round a roundabout it somehow reved high and a white smokescreen bellowed out the back as if it was a turbo and the tubo had packed in by sending iol onto the inlet and running on it , now it only did it for about 5 seconds then after it cleared up ,, i got it home and checked the oil cap by taking it off and reving the engine to see if it sucked the cap down , did it , did it hell , it blew back as if the engine was breathing ,, its only done 52 thousand miles and i think the oil came from the rocker box and threw the breather directly into the inlet and burned that way ,, any ideas on when could be causing it ,,, by the way it ran down the motorway fine only couthing a bit of black smoke out when changing gear , bit of over fueling i think , nothing to worry about , but the white smoke and oil pressure is a worry , all help greatly accepted ,, maybe breathers blocked ? .. kindest regards Daz