I have a 2003 passat 1.9TDI Yesterday the low coolant light came on but the temp gauge remained at 90. On removal of the expansion tank cap I found it to be full of engine oil, not cream just completley black engine oil/water. I checked the dip stick and found a small amount of oil left(it was full less than 2 days before as i checked it) It had an oil cooler 2 years ago but last time the coolant was cream. The oil cooler has been changed again now but the engine will not hold the oil. Does anyone have any idea's on next plan of action? could it be the head gasket, head or even block.