How much is a 2018 Mercedes-Benz S-ClassDiesel worth in Ireland?

Carintel.ie tracks 4 live 2018 Mercedes-Benz S-ClassDiesel listings on the Irish market. Sign up free to see the true market value, price range, and how it compares to NI import prices.

How much does a 2018 Mercedes-Benz S-Class depreciate per year?

Carintel.ie calculates Mercedes-Benz S-Class depreciation from real listing data using regression analysis. Sign up free to see the annual depreciation rate and forecast.

Is it cheaper to import a 2018 Mercedes-Benz S-Class from Northern Ireland?

It depends on spec, mileage and CO2. Carintel.ie compares ROI median prices against Northern Ireland listings' landed cost, including VRT, NOx levy and registration fees, so you can see the saving at a glance on this page.

What are the running costs of a 2018 Mercedes-Benz S-ClassDiesel?

This page estimates annual running costs for a 2018 Mercedes-Benz S-ClassDiesel using WLTP consumption data, current Irish fuel and electricity prices, and Irish motor tax bands.

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Analysing market data

Fetching listings · computing fair value · building charts

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Trim:All AMG · 3 Unknown · 1

Market Intelligence

Mercedes-Benz S-Class2018

Diesel

€50,475ROI listing median

77 days avg on market · Low data confidence

High DemandLimited Data

Listing price range

€47k – €55k

middle 50% of listings

Listings

ROI active now

Updated 14h ago · ROI · Low confidence

Expected price

€50,475

retail ~€50,475 · private ~€44,499 Pricing assumptionsAssumptions· Good condition, full service history· No outstanding finance or damage· Based on ads seen in the past 30 days

Est. trade-in

€31,149 – €37,824

Avg mileage

105k km

typical 73k km

Days listed

77d

avg on market · demand 75/100

AI Market Summary

Diesel engines prone to DPF and injector carbon issues—ask seller for service history showing regular motorway driving to prevent regeneration failure costs (€1,500–€3,000).
Below-average reliability score for a premium saloon; AdBlue and NOx sensor faults common, so budget for potential warning light diagnostics before purchase.
Median mileage (73k km) sits below typical Irish wear for 8 years old—verify complete service records and odometer consistency to rule out short-trip urban use that accelerates DPF clogging.
Check AdBlue tank level and system status during viewing; request latest diagnostic scan report to confirm no pending fault codes.
Market pricing appears fair for condition, but factor diesel repair costs into total ownership budget given known engine and emissions system vulnerabilities on this generation.

AI-generated analysis · Carintel.ie · verify independently before purchasing

Analysis & Insights

Price Analysis Costs Import Recalls & Info

Vehicle specification

Manufacturer WLTP data

Power

255 bhp

Torque

620 Nm

457 lb·ft

0–62 mph

6.65s

155 mph top

Engine

2.9L

2900 cc

Boot space

510L

Seats

4 doors

Fuel economy & emissions

Combined

49.15000000000001 mpg

5.75 L/100km

Urban

39.8 mpg

Extra urban

55.4 mpg

CO₂

148 g/km

EURO 6

Fuel tank

70L

Dimensions

Length

5.25m

5246 mm

Width

1.90m

Height

1.49m

Wheelbase

3.17m

Kerb weight

1,975 kg

2,690 kg gross

Safety & ownership

Insurance

Group 46A

Warranty

3 years

Reliability & Safety Recalls

Mercedes-Benz S-Class 2018

Reliability

3/5

The 2018 S-Class diesel (OM656 engine) is a sophisticated executive sedan with strong engineering but high complexity and expensive repairs. Ownership is reliable if well-maintained, but costs escalate quickly due to diesel particulate filter issues, AdBlue system problems, and premium labour rates. Not recommended unless you have substantial service budget and access to specialist diagnostics.

Known issues

DPF regeneration cycles fail frequently, leading to limp mode and expensive cleaning/replacement (€1,500–€3,000)
AdBlue system malfunction and NOx sensor faults causing warning lights and reduced performance
Diesel injector carbon build-up on OM656 engine, particularly with low-mileage or short-journey driving
Automatic gearbox (9G-Tronic) hesitation and jerky shifts, sometimes requiring software updates or valve body replacement
Air suspension (E-AIRMATIC) compressor failure and sensor faults leading to uneven ride height or system shutdown
Turbocharger wastegate sticking, reducing boost pressure and fuel economy

Good for

Smooth, quiet motorway cruising with excellent refinement and comfort for long distances
Strong low-end torque (400 Nm) and real-world fuel economy of 35–42 mpg under gentle driving
Luxurious interior technology, safety features, and build quality for premium ownership
Excellent resale value if maintenance history is complete and major components are sound

Years to avoid: 2018, 2019

AI-generated summary · verify with DVSA & owner forums