Your car is now nine years old, which makes it difficult to claim on VW, but it has only done 70,000 km, so that’s in your favour. If a VW dealer had been servicing it I would attempt to convince VW ...

You said it yourself; it's tired, so I wouldn't fit a turbocharger without rebuilding the engine. You'd be asking for trouble to do it without doing the engine. While the ZD30 engine should have been ...