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Mercedes-Benz S-Class buying guide (Ireland, 2026)

What a used Mercedes-Benz S-Class costs in Ireland, how it does at the NCT, what goes wrong and what it costs to fix. Based on 70 for sale right now.

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Our take on the Mercedes-Benz S-Class

A 2021 Mercedes-Benz S-Class typically advertises at €64,950 and a 2016 one at €26,950, so it loses roughly 16% of its value a year at that age, faster than most cars. Most for sale are diesels (74%), which suit longer, regular drives; for mostly short trips a petrol is the safer buy. At the NCT, the 2014–2016 cars do better than other cars the same year. The 2.9 diesel is the most common engine (66% of those with a known engine), and it usually lasts around 400k km.

Check a Mercedes-Benz S-Class's priceNCT pass rate by year

Used Mercedes-Benz S-Class prices by year

Typical asking price by registration year, and typical mileage. Private sellers usually take 5–10% less than asking; expect dealers to be a little dearer.

Mercedes-Benz S-Class NCT pass rate

How often Mercedes-Benz S-Classes pass their NCT first time, compared with other cars the same year (Road Safety Authority (RSA), NCT make & model data 2025, initial tests).

Most common reasons a 2018 Mercedes-Benz S-Class fails: wheel alignment (15.2% of tests, more than most cars), steering & suspension (13.9% of tests, more than most cars), wheels & tyres (12.5% of tests, more than most cars), emissions (9.7% of tests, more than most cars).

Cheap fixes before the NCT (eBay.ie): Tyre tread depth gaugeOBD2 fault code reader

Common Mercedes-Benz S-Class problems

Known weak spots to check before you buy, with typical Irish garage costs if the problem is there.

Engines and how long they last

2.9 Diesel: usual problem: injector seals and timing chain on 2.1 CDI.

3.0 Diesel: usual problem: injector seals and timing chain on 2.1 CDI.

"Usually lasts" is the mileage these engines commonly reach before major work; service history matters more than the number.

Parts and upgrades for the Mercedes-Benz S-Class

Parts for the Mercedes-Benz S-Class on eBay.ie

New and used parts from Irish and UK sellers. Check the part number or fit before you buy.

Brake padsCheck front or rear, and the disc size if there are twoSee on eBay.ie →Brake discsReplace in pairs, with new padsSee on eBay.ie →Oil filterChange it at every oil serviceSee on eBay.ie →Wiper bladesSplit or smearing blades can fail the NCTSee on eBay.ie →BulbsA blown bulb is an easy NCT failSee on eBay.ie →BatteryCheck the size and terminal layoutSee on eBay.ie →OBD2 fault code readerReads engine fault codes on your phoneSee on eBay.ie →

Example photos, not the exact product (Wikimedia Commons): Treemonster86, CC BY-SA 3.0; Tharish, CC BY-SA 3.0; Dvortygirl, CC BY-SA 3.0; Wesha, Public domain; Mib18, CC BY-SA 3.0; Cjp24, CC BY-SA 4.0; Arp, Public domain.

Upgrades for the Mercedes-Benz S-Class

Popular add-ons. The mats are made for this model; the rest fit most cars. More car accessories →

Floor matsMade to fit the Mercedes-Benz S-ClassSee on eBay.ie →CarPlay screenAdds Apple CarPlay (and usually Android Auto) to a car without it: sits on the dashSee on eBay.ie →Wireless CarPlay adapterFor cars that already have CarPlay with a cableSee on eBay.ie →Reversing cameraMakes parking easier; some CarPlay screens come with oneSee on eBay.ie →Phone holderKeeps your phone off your lap for directionsSee on eBay.ie →Dash camFootage settles insurance arguments quicklySee on eBay.ie →

Example photos, not the exact product (Wikimedia Commons): Keystones, CC BY-SA 3.0; Butterhimmel, CC BY-SA 4.0; Sunnyboy122, CC0; https://www.flickr.com/photos/banoootah_qtr/, CC BY 2.0; Shixart1985, CC BY 2.0; Ellin Beltz, CC BY-SA 3.0.

Before you buy a used Mercedes-Benz S-Class

Run a history check on the reg (write-off, finance owing, mileage), ask when the last service was done and for receipts, and start it from cold yourself. The used car checklist takes you through a viewing step by step.

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