The 2017 Golf is the Mk7 (facelift from 2017 known as 7.5) and diesel automatics are commonly paired with VW’s DSG gearbox and either 1.6 or 2.0 TDI engines. Expect good real-world fuel economy on long runs, but check for DPF and EGR symptoms on cars used mainly for short trips; some 2.0 TDIs also use AdBlue/ SCR hardware which should be functioning and serviced. DSG maintenance (periodic oil/filter change and any software updates) is important — repairs can be expensive if neglected.

• DSG gearbox service history and behaviour — confirm oil/filter change intervals have been done and check for smooth, fast shifts or any jolting/hesitation.
• DPF condition — look for frequent regen cycles, excessive soot in the tailpipe or persistent DPF/engine-management warnings (common on short-trip diesels).
• AdBlue system (likely on 2.0 TDI) — check filler cap present, no warning lights, and no unusually high AdBlue usage or pump noises.
• Turbo and intercooler for shaft play or oil leaks — light blue smoke on acceleration or boost lag can indicate turbo seal wear.
• Underbody, rear arches and suspension mounts for corrosion and wear, plus brake disc/pad condition (Irish roads and salt can accelerate corrosion).