2009 MERCEDES-BENZ S 550 VIN WDDNG71X09A274415

The Mercedes-Benz S 550 described here left the factory in 2009. There is an automatic gearbox, with rear-wheel drive. The engine is a 5.5-litre petrol unit with eight cylinders. Every figure for this car is given as it appears in the source data.

The source data puts the mileage at 124,122 miles. Miles and kilometres are easy to confuse, and a distance in miles looks lower than the same distance in kilometres. A single figure proves little: what makes a mileage believable is a series of readings that rise steadily over the years. A service book or a folder of workshop invoices is the simplest place to find past readings.

When the car was recorded, it showed minor dents and scratches. Whether the damage has been repaired since, and how well, is not something a damage entry can show. A lift and a diagnostic check show what photos cannot: bent brackets behind a panel, chafed wiring or deployed airbags.

A key was present. A condition note describes the car at one moment; months of standing or later work on the car can change the picture in either direction.

A car’s history answers three questions: who kept it, how it was looked after and what went wrong along the way. The paperwork is kept by different bodies – registries, workshops, insurance companies and lenders – so the history of one car is spread across many places. Much of a car’s past cannot be seen: a good body repair leaves no obvious mark, and neither do years of hard driving.

A cold start, the colour of the exhaust smoke and any oil leaks tell a mechanic a good deal about how an engine has been treated. On a petrol engine, a rough idle, misfires or a warning light on the dashboard need looking into. Automatic transmissions, CVTs included, are expensive to repair, so the test drive should include pulling away from a standstill and a stretch at motorway speed.

A vehicle identification number has 17 characters: the first three name the manufacturer, the next six describe the model and its specification, and the last eight identify the individual car. This Mercedes-Benz S 550 has the VIN WDDNG71X09A274415. The number in the car’s documents should match the one stamped into the body and the one on the plate at the base of the windscreen.

Where entries exist, a VIN check can show changes of owner, past mileage readings, reported damage and whether the car is listed as stolen. A repair paid for in cash at a small workshop leaves no trace in any database, so no report can list it. However complete the paperwork, only an inspection shows the condition of the body, suspension, brakes and electrics today. Before any decision, check what is known about VIN WDDNG71X09A274415.