The 2017–2018 Koleos is the second-generation Renault SUV on the Renault–Nissan platform, with a comfortable cabin and often available with 4x4 on higher trims. As a diesel automatic you should expect DPF and EGR hardware (and sometimes AdBlue on later diesel variants) so it prefers regular longer runs rather than only short urban trips. Automatic transmissions in Koleos can be either conventional torque-converter types or CVT-style units depending on engine — confirm which one this car has and whether the gearbox service intervals were followed.

• DPF and EGR condition: evidence of recent regenerations or a history of long motorway runs; check for warning lights and heavy soot smell after a drive.
• Automatic gearbox behaviour and service history: check for smooth shifts, any juddering/hesitation and whether gearbox oil/filters were changed per manufacturer schedule (identify if it's CVT or torque-converter).
• Turbo and boost system: listen for unusual turbo noise, check for oil leaks at the charge-pipe joints and look for excessive smoke on start-up or acceleration.
• Underside and suspension: inspect for scrapes, wheel-arch/underbody corrosion and check rear suspension for sag if the car has been used towing or carrying heavy loads.
• Electrics and comfort kit: test cameras, parking sensors, heated seats and infotainment — electrical gremlins are a common gripe on older Renaults.