Luxury cars are all about wafting you along in a bubble of calm, so a soothing ride and exceptional noise suppression are key.
A cabin made from the finest materials and lovingly put together are other prerequisites, as is a sense of well-being, whether you're driving the car or employing someone to do it for you.
Running costs are less important than with other cars, but you don't get to run a luxury car by throwing your money away, so low tax bills are a bonus.
Mercedes S-ClassBest buy less than £70,000
It's the way this latest S-Class does everything better - far better - than its rivals that really sets it apart.
Range RoverBest buy £70,000-£100,000
The Range Rover has a genuine blue-blooded image, so looks equally at home on your country estate as it does outside your pad in Knightsbridge.
Rolls-Royce PhantomBest buy more than £100,000
It takes a special car to successfully fend off its rivals for eight years - and the Rolls-Royce Phantom is just that car. Yet again, it's the best top-end luxury car money can buy.