2004 Mercedes S CLASS S320 CDI

The W220 S320 (1998-2005) used the M112 3.2-litre V6 with 224hp. Popular choice offering adequate performance with reasonable running costs.

Engine: M112 V6 reliable. M113 V8 generally good but check for oil leaks. M137 V12 (early) - coil packs, wiring. M275 twin-turbo V12 - more reliable but turbos expensive. AIRMATIC: Standard on most - expensive when faulty. Struts, compressor, valve block all fail. Budget £2-4k for overhaul. ABC: On AMG/V12 - even more expensive. £5k+ for full service. SBC Brakes: Sensotronic problematic - many converted to conventional. COMAND: Screen failures. General: W220 reliability worse than W140. Facelift (2002+) improved. Avoid high-mileage neglected examples.

Facelift model (2002+), V8 or V12 engine, Long wheelbase, Keyless Go, Distronic, Night Vision, Designo leather, AIRMATIC working (or budget for repair), SBC converted (or working), Full service history