Gearbox: Make sure the service regime has been followed. This includes changing the oil in the seven-speed automatic gearbox every 40,000 miles. Check that shifts are smooth as well.
Suspension: Pay attention to the suspension on your test drive, because it should keep the car flat when cornering. If not, a new pump could be required.
Interior: The Comand sat-nav system allows you to enter only a four-digit postcode, but Mercedes can upgrade it to seven-digit functionality. If this hasn’t been done, it could be worth asking for the work to be completed before agreeing to buy the car.
Engine: With the diesel engines, listen for excessive rattling at idle. This could indicate a stretched timing chain and, if left unchecked, this can result in a catastrophic engine failure.
Electrics: Electrical problems are common and repairs can be very expensive. Among the most prevalent issues are failed amplifiers, broken inflating seat bolsters and faulty keyless entry. Use a trickle charger to keep it topped up if you plan to leave the car standing for a long period, as a flat battery can play havoc with electrical systems.
Exterior: Some owners report finding corrosion and blistered paint, so look over the car carefully before buying.
