Beware of nasty noises, smoke, coolant leaks, or engine misfires – a hefty bill could be coming your way.
Clutch slip can be costly. Vibrations – from a dodgy DMF - may be more costly still.
If it’s not taut, it’s not right. Saloons and hatches suffer from rear suspension bush failure.
Rear calipers stick and seize, expect to replace them ( and wheel bearings) frequently.
Rust can be a big worry. Check the door bottoms, rear wheelarches and tailgate for corrosion.
Beware of dashboard warning lights. A knackered alternator is very bad news.