Assuming this is the Nissan X-Trail–style SUV sold around 2020, diesel manuals are generally tuned for economy and towing rather than brisk performance. Key points: diesel engines here are happy at steady motorway speeds but can suffer DPF/EGR clogging if used mainly for short urban trips, and manual cars mean you should watch clutch wear. Some X-Trail variants were offered with an optional third row — confirm the actual seat count and whether 4x4 is fitted if that's important to you.

• DPF and EGR condition — ask for evidence of regular long runs and watch for frequent regeneration warnings or a soot-smudged oil filler cap
• Manual clutch feel and bite point — test for slipping or a high-engagement point, especially if the car has been used for towing
• Turbo health — check for excessive smoke on spool-up and listen for whines or rattles under boost
• 4x4 system/centre coupling (if fitted) — engage 4WD on a test drive and check for noise, judder or warning lights
• Underside and rear suspension — look for signs of towing use (sagged springs, wear to towbar area) and corrosion around wheelarches and sills