With a 5.0-litre twin-turbo V10 producing 572bhp, the RS6 C6 is a tempting proposition, especially as they can become absolute monsters, when tuned.

But – and there's always a 'but' – they can be eye-wateringly expensive to maintain!

In this video, we talk you through an engine swap on a rare, low mileage saloon and answer the question: Should you buy an RS6 C6?