Get a used Mercedes-Benz S-Class inspected: on-site used-car inspection, from €289

checkdenwagen.de is an independent provider of on-site used-car inspections operating throughout Germany, based in Berlin with a network of inspectors across the whole country. The Mercedes-Benz S-Class is the brand's flagship — and on the used market a vehicle with one of the sharpest follow-up-cost profiles in the entire premium segment. Heavy depreciation means low entry prices that mask the true running costs. Four generations mean four different weak-point profiles — and in each of them a single undetected defect easily exceeds the level of the purchase price. In the W220 (1998–2005) it's the first-generation Airmatic air suspension, body rust and the notorious SBC brake system. In the W221 (2005–2013), the Airmatic, the Active Body Control (ABC) as the most expensive suspension option and the COMAND infotainment dominate — plus the OM642 V6 diesel with its oil-cooler weakness and the M273 V8 with its sliding-rail design flaw. In the W222 (2013–2020), system complexity reaches a new level with Magic Body Control, the OM656 diesel, the 9G-Tronic and fully networked comfort electronics (massage seats, auxiliary heating, multi-contour seats). The W223 (from 2020) is young enough for different inspection priorities, but remains no free pass for an unchecked purchase. Our inspector examines your desired S-Class on site for around 1.5 hours using an inspection catalogue with over 100 points — with a generation-specific focus on suspension, engine, transmission and electronics. You receive your report within 24 hours.

The third modern S-Class (W220, 1998–2005) introduced the Airmatic air suspension as standard equipment in the model line — and with it its best-known weak point. Porous air-spring bellows, failing compressors and an electronic suspension system that was still new at the time made W220 owners familiar with the follow-up costs of the premium segment. Added to this is the SBC brake (Sensotronic Brake Control), which was fitted in certain model years of the W220 and drastically reduces braking performance when the control unit fails. Body rust at the sills and wheel arches is a real problem on W220 examples from road-salt regions. Engines: the M113 V8 petrol is considered robust; the OM612 diesel occasionally shows turbo and injection problems. The fourth generation (W221, 2005–2013) refined the concept and added the optional Active Body Control (ABC) — a hydraulic active suspension that compensates body roll in real time. ABC is the most expensive and most demanding suspension system Mercedes has ever installed in an S-Class. Failing hydraulic pumps, leaking ABC struts and expensive control-unit repairs are the known cost drivers on W221 models with ABC. The OM642 V6 diesel brings its oil-cooler weakness (mixing of engine oil and coolant) and occasional injector problems with it. The M273 V8 has the design-related balance-shaft sliding-rail defect. The 7G-Tronic transmission is ubiquitous in this generation — with the known mechatronics weaknesses. The fifth generation (W222, 2013–2020) marks the peak of analogue S-Class complexity. Magic Body Control reads the road via stereo camera and adjusts the suspension before driving over a bump — a system that is correspondingly costly when faulty. The OM656 inline-six diesel is considered technically mature, but repair-intensive at high mileage. The comfort electronics (massage seats, multi-contour seats, auxiliary heating/climate control, Burmester sound system) bring a spectrum of fault sources that other vehicles don't know. The 9G-Tronic transmission replaces the 7G-Tronic — with less-known long-term experience, but its own jerking problems on early examples. The current S-Class (W223, from 2020) is equipped with the MBUX Hyperscreen, a 48V mild-hybrid system and a largely digital control structure. The OBD readout for faults cleared shortly before sale, the paint-thickness measurement for accident history and the odometer-reading plausibility remain the most important inspection priorities for this generation.

The choice of engine on a used S-Class depends heavily on the generation and your personal risk profile. In the W220 (1998–2005), the M113 V8 petrol (S 430, S 500) is considered a comparatively robust choice if it has been serviced regularly. The OM612 and OM628 diesels of this generation have specific turbo and injection problems and are encountered less often. In the W221 (2005–2013) the engine line-up is broader. The OM642 V6 diesel (S 320 CDI, S 350 BlueTEC) is widespread — but the oil-cooler defect makes a careful inspection essential. The M273 V8 (S 500, S 550) is the most popular petrol, but the balance-shaft sliding-rail design flaw calls for a targeted OBD check. Anyone wanting to play it safe should look for a well-maintained S 320 CDI with a complete service book and a documented oil-cooler replacement. In the W222 (2013–2020), the OM656 inline-six diesel (S 350 d, S 400 d) is recommended as a technically mature choice — provided the vehicle hasn't been used purely for short trips and the service history is traceable. Petrols (M276, M278) are rarer in this generation and can show specific weaknesses in their ancillary units. Recommendation: anyone looking to buy a used S-Class should give preference to a W222 S 350 d with the OM656, a traceable service book and at least one check by an independent inspector. With the W220 and W221 the risk profile is higher — here a full check with an OBD readout of all control units and a targeted Airmatic/ABC inspection is indispensable.

The used market for the Mercedes-Benz S-Class is shaped by a price structure that buyers systematically underestimate: the entry price is low, the follow-up costs are high. A W220 with 150,000 kilometres can be bought for a fraction of the new price — but without knowledge of the Airmatic, SBC and rust condition, the actual value is impossible to calculate. Common price drivers in the listing that aren't always justified: freshly reconditioned looks, near-full-equipment designations or 'workshop-maintained' notes without a traceable service book. Common price traps: vehicles with an already faulty or soon-due Airmatic, ABC or comfort electronics whose repair needs clearly exceed the purchase price. The price range within a single generation is enormous on the S-Class: two W221 S 500 of the same model year can differ in actual value by several thousand euros — depending on whether the Airmatic, ABC, transmission and engine history are sound or not. The independent used-car inspection gives you the factual basis to tell a genuine bargain from an expensive risky buy. And it gives you arguments for the price negotiation — every documented defect is a justified deduction from the asking price.