Ted19790

Hello everyone...I have a 1.6 petrol 2006 8P. It has started putting oil all over the boot lid and rear bumper so must be burning oil. There's is white goo in the oil cap so thinking head gasket. Hasn't lost water just oil level goes does. At idle it goes really lumpy and has on one occasion kangarood really badly let a big cloud of black smoke and then was fine.....any help