Glass’s experts give the lowdown on what’s selling and what’s sitting

Going up:

SAAB 9-3 1.9 TiD
This new diesel unit is a vast improvement over the old, noisy 2.2, and is in short supply, making it a very popular car

BMW 320 DIESEL COUPE
BMW diesel engines and coupe styling equals very high demand among used buyers

OLD-SHAPE AUDI S3
The old shape S3 is a rarity, plus no equivalent in the new model yet, only a standard 3.2 V6, so prices are staying firm

Going down:

BASE MODELS
Poverty spec in exec cars are still very bad news. Nobody wants them, even second-hand buyers

MERCEDES-BENZ S-CLASS
There’s a new model on the horizon and there is plenty of plenty of supply about. It faces testing times in its run-out year

BMW 318 ESTATES
Values will temporarily struggle until the current oversupply eases