Mercedes-Benz S 320W

Thoroughly inspect the Airmatic suspension: check for sagging, listen for compressor noise, and test all suspension modes.

Check for rust, especially under the hood, around wheel arches, and door bottoms.

Ensure all electronic features (COMAND, seats, windows, mirrors) are fully functional.

Obtain a detailed service history, focusing on transmission fluid changes and suspension maintenance.

Consider a pre-purchase inspection by a Mercedes-Benz specialist familiar with W220 specific issues.

Factor in potential future maintenance costs; this is not a cheap car to run, even if the initial purchase price is low.

Be wary of heavily modified or poorly maintained examples; originality often indicates better care.