Originally Posted by
Scoff
there still isn't enough information there to know exactly what's happened.
do these tests:
remove the oil filler cap, look at the oil on the cap, it should be nice brown (or black if its old). If there is white "mayo" like cream mixed in with the oil then your headgasket has probably gone (maybe a result of it overheating)
if the oil under the cap looks clean, look in the header expansion tank, that should be clean water too (well OK, probably brown by now) but there should not be oil in there (IE rainbow effects)
If both of those are OK then look at what colour the smoke is. If its light blue and smells like burning oil then maybe its time for a new turbo.