I discussed it with my local mechanic before getting mine, he'd recommended to stay away from the smaller engine Octavias, and so I ended up with another diesel. I'd agree with making sure timing belt and water pump are done at the appropriate time, its a large expense to get done otherwise.
Some of the diesels in that age are subject to the recall, which may or may not work in your favour for negotiation if you go that way. I can't fault the fuel economy of mine.
2012 TDi DSG Tiguan
2011 TDi DSG Octavia Wagon
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