Most 2012–2019 i40 diesels use the 1.7 CRDi family with a 6‑speed manual; they’re torquey and economical on long runs but like regular motorway use. Expect a DPF and EGR system on this variant — both can suffer if the car has been used mainly for short urban trips; check for evidence of forced regenerations and ask about typical usage. Hyundai parts are widely available in Ireland and routine servicing costs are reasonable compared with European premium brands.

• DPF/EGR condition — watch for warning lights, excessive soot, or a strong diesel smell; ask whether the car does regular long motorway runs to allow proper regeneration.
• Clutch operation and pedal feel — check for slipping under load and listen for rattles that can indicate a worn dual‑mass flywheel.
• Turbo and injectors — look for smoke on acceleration, oily residue on intercooler pipes, or free play in the turbo shaft.
• Gearbox syncros — ensure smooth shifts into 2nd/3rd and no crunching or grinding when changing gears.
• Body and underfloor — inspect rear arches, sills and boot floor for age‑related corrosion or signs of water ingress.