[ngoma]

You are correct that blue smoke usually indicates burning oil. Somehow oil must be entering the combustion chamber. I can only think of piston rings, valve guides, or possibly holed piston? I suppose a damaged turbocharger could divert oil into the intake.

Very interesting your description of what happened.

Driving normally except for voluminous black smoke, then a single loud "clunk," then no more black smoke, but voluminous blue smoke?

No change in engine tone otherwise?

Same performance before/after the "clunk?"

Smooth idle?

What is the oil level?

I'd be hesitant to run the engine before a good inspection.