This is a W205‑generation C‑Class diesel from around the 2018 facelift era; diesel four‑cylinder engines were common and automatics are more usual, so a manual is slightly less common but straightforward. Pay attention to diesel‑specific systems — DPF and EGR can give problems if the car has mostly done short urban trips, and later diesels may use AdBlue dosing. Mercedes parts and dealer labour cost a bit more than mainstream brands, though parts are widely available in Ireland.

• DPF condition and regeneration history — ask if it’s been used on regular long runs or mainly short city trips (blocked DPF is common on 8‑year‑old diesels).
• Clutch and dual‑mass flywheel feel — manual C‑Class can need a new clutch/DMF around this age if used hard; check for slipping or judder.
• EGR valve and turbo health — look/smell for excessive smoke, check for boost lag or oil leaks from turbo and inlet tract.
• AdBlue dosing system (if fitted) and injector seals — ensure AdBlue tank/sensor lines and injector area are dry and fault‑free.
• Lower body and rear arch corrosion and suspension bushes — check around wheelarches, subframe mounts and for worn rear suspension bushes that make the ride feel loose.