Blue smoke is oil burning,could indicate different probs,best case senario it's the oil seals on the turbo.Worst case it could be engine wear,valve stem seals etc. Probably the turbo seals tho. Petrol wise don't use 95RON fuel as you will damage the engine! Use at least super unleaded/v power or tesco 99RON. Japs have 100 RON fuel so the cars are mapped for it,i use tesco 99RON in mine with no issues as it's closest to the jap fuel.