White smoke is typically water not oil... oil smoke is blue....
Did you get a hydrocarbons test done at the garage? prob worth getting that done to see... as I have said in your previous threads mate, I reckon the previous owner sold it like this knowing the car over heated... chances are the heads warped and you have a leak from the head gasket but tbh the heads on these can crack easily if subjected to that type of failure and its entirely plausible that the head has cracks and this is what you are seeing...
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