You here so many stories of problems with the incredibly complex Adblue systems that are required on modern diesels that I would steer clear if your friend is thinking of this as a long term car. Especially as he's not an enthusiastic driver, so is less likely to 'clear the system'. But then, as he's seen, when you are used to the low-down torque of a diesel, petrols are quite different to drive.
May be better to stick with what he's got? Plenty of life in it yet.
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