Peugeot 308 2012 Problems
No car is perfect, but we've gathered everything relating to the Peugeot 308 2012 reliability here to help you decide if it's a smart buy.
Peugeot 308 2012: Failing turbocharger
I would think the problem is not an oil pressure problem, but more likely an oil supply problem to the turbocharger. It would be a severe problem given that the turbocharger is lasting a mere 30 km. I would expect that he has changed the oil when replacing the turbocharger, but that would be a must if he hasn't done it. There are no 'lemon' laws in Australia, so you have to battle that one alone.