Older Audi A8s aren't dependable, according to the What Car? Reliability Survey, while the average cost of repairs is well over £500. The A8 looks built to last, but the complicated air suspension threatens horrendous bills if it develops faults, so check it out thoroughly before you part with any cash.

Audi engines are proven and reliable, but the gearboxes and clutches will need overhauling once the miles mount up. We'd worry that those complicated electrics might give trouble, too.

Despite the cost, correct servicing is of paramount importance, while a full set of main dealer stamps in the service books is essential to maintain the car's resale value. Skimping on proper servicing now could cost you in the future.

The cost of fixing that aluminium body is an even greater concern. Regular crash repairers won't touch it, leaving just a few specialists to tackle the work - and charge you plenty for the privilege.

Four-wheel-drive (quattro) models should have all four tyres replaced at once to maintain traction and handling - a full set can easily cost £1000.

What alternatives should I consider to a used Audi A8 saloon?

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