This is the second-generation Insignia (Grand Sport / Sports Tourer family) — the Grand Sport is a large fastback/hatch while a Sports Tourer estate also exists. The diesel/manual combo is well suited to high-mileage motorway use but watch DPF/EGR behaviour and (if fitted) the AdBlue/ SCR system on a 4-year-old diesel. Opel parts are straightforward to source in Ireland and the manual gearbox is generally robust, though clutch wear can appear if the car has been used a lot in town.

• DPF and EGR condition — look for frequent regeneration events, soot on exhaust, or warning lights (blocked DPF is common on short‑trip diesels).
• Clutch and gearbox — test for slipping, unusual engagement point or crunching when changing gears, and check for smooth selection.
• Turbocharger signs — listen for whining/whistling, check for smoke on start/acceleration and inspect for oil leaks at the turbo inlet/outlet.
• AdBlue system (if present) — confirm filler cap, dosing pump sounds and no warning messages about SCR faults.
• Underbody/exhaust and rear-arch corrosion — inspect wheelarches, chassis rails and the exhaust hangers for rust or repair evidence.