How much does a Mercedes-Benz E300d engine replacement cost in the UK?

A reconditioned Mercedes-Benz E300d engine (OM654) typically costs £3,500–£6,000 supply only, varying by generation: pre-facelift £3,500–£6,000, facelift £4,000–£7,000. Fitting adds £1,200–£1,800. A camshaft/follower replacement costs £1,500–£4,500. Check the Era Map above for your engine code.

Is the Mercedes-Benz E300d reliable?

The OM654 engine's reliability is very much dependent on how well it has been maintained. Some owners have reported issues with wear to the valvetrain including camshafts and tappets, while others have passed 150,000–200,000 miles without problems. Mercedes changed the specification of some internal parts on later models, so post-2020 cars are more robust. A post-2020 facelift car with full Mercedes history is the buy.

What are the common problems with the Mercedes-Benz E300d?

Camshaft and cam-follower wear (top-end rattle on cold start, £1,500–£4,500), injector seal leaks ('black death', £600–£1,200), DPF/EGR issues (£400–£1,200), AdBlue system failure (£500–£1,500), and 9G-Tronic gearbox issues (£800–£2,500).

Is it worth replacing a Mercedes-Benz E300d engine, or should I scrap the car?

E-Class values range from £8,000–£35,000 depending on generation, condition and mileage. A £3,500–£6,000 reconditioned engine represents 10–80% of vehicle value — our 70% Mercedes-Benz scrap threshold means careful evaluation is required. For a well-maintained facelift (2020+) example, replacement is often justified. For an ageing pre-facelift with other issues, assess scrap value first.

How do I find my Mercedes-Benz E300d engine code?

The E300d uses the OM654 engine code — Mercedes' 2.0-litre four-cylinder diesel producing 261 bhp. The pre-facelift (2016–2020) and facelift (2020–2023) share the same engine code but with internal revisions. Check your VIN or registration year. The code is stamped on the engine block.

Can I repair the camshaft wear issue, or does it need replacement?

Yes — if caught early. Camshaft and cam-follower replacement costs £1,500–£4,500 and is significantly cheaper than a full engine replacement (£3,500–£6,000). The one fault worth knowing in detail is camshaft and cam-follower wear on the OM654 diesel, reported by some owners at higher mileages. At the first sign of top-end rattle on cold start, book an inspection immediately. More frequent oil changes will help keep the engine in good health.

Mercedes-Benz E300d2016–20232.0L Turbo Diesel

Mercedes-Benz E300d Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes-Benz E300d UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

Get quotes today from trusted UK Mercedes-Benz diesel specialists. The E300d is the 261bhp 2.0-litre OM654 turbo diesel — smooth, efficient and refined. Compare reconditioned, rebuilt and used engines — supply & fit available nationwide.

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Mercedes-Benz E300d Engines — from £2,000 to £8,000Code: OM654

Mercedes-Benz E300d Engines — from £2,000 to £8,000· Code: OM654

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Mercedes-Benz E300d — Which Engine Does Your Car Actually Have?

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

261bhp 2.0T — camshaft/follower wear is the defining risk

GenerationYearsEngine CodeReliabilityRecon CostEra Note

W213 (pre-facelift) BMW 320d W213 (pre-facelift)

2016–2020OM654 (2.0L 4-cyl diesel)★★★½☆ [NEWLY ASSIGNED — see Data Note]£3,500–£6,000 [PLACEHOLDER]261bhp 2.0T — camshaft/follower wear is the defining risk

W213 (facelift) BMW 320d W213 (facelift)

2020–2023OM654 (2.0L 4-cyl diesel, revised)★★★★☆ [NEWLY ASSIGNED — see Data Note]£4,000–£7,000 [PLACEHOLDER]Revised internal parts — improved reliability

Why use this era map?

This table is the single source every other section on this page matches — Sections 2, 4 and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes-Benz E300d Engine Replacement Costs

Supply Only£3,500–£6,000

Fitted (Indie)£4,700–£7,400

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£3,500£3,000–£4,7001–6 monthsBudget priority; lower-mileage donor

Reconditioned Engine£3,500–£6,000£4,700–£7,40012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£5,000–£7,500£6,200–£8,90012–24 monthsLong-term ownership; 5+ year horizon

Main Dealer New£7,000–£11,000£8,500–£12,50024–36 monthsInsurance jobs, warranty claims

Figures above reflect current market ranges across both E300d generations. Reconditioned units for the facelift (2020+) typically command a premium due to revised internal parts. Reconditioned engine costs typically range from £1,200 to £2,200 supply only, with premium marques commanding higher costs.

Labour estimate: Fitting an E300d engine typically takes 10–14 hours at £75–£110/hr (independent Mercedes specialist) or £130–£180/hr (London/SE dealer). The OM654's compact four-cylinder layout makes it relatively accessible.

→ Compare Mercedes-Benz E300d engine prices from UK specialists

Common Problems

1. Camshaft and Cam-Follower Wear (OM654 — All Generations)

2. Injector Seal Leaks (OM654)

3. DPF and EGR Issues (OM654)

4. AdBlue System Failure

5. 9G-Tronic Gearbox Issues

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Mercedes-Benz E300d — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Mercedes-Benz E300d — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseCamshaft/cam-follower wear✅ Yes£1,500–£4,500Preventative — if caught before catastrophic failureInjector seal leaks✅ Yes£600–£1,200Straightforward fix — always worth doingDPF blockage✅ Yes£400–£1,200Forced regen or cleaning — worth itEGR clogging✅ Yes£500–£1,200Cleaning or replacement — worth itAdBlue system failure✅ Yes£500–£1,500Viable on any well-maintained example9G-Tronic gearbox issues✅ Yes£800–£2,500Viable — valve body or TCU repair often possibleMajor internal failure❌ Usually NoEngine replacement requiredAssess vehicle value carefully

Buying This Mercedes-Benz E300d? Check These First

Buy If

Post-2020 facelift model — revised internal parts improve reliability
Full Mercedes service history with regular oil changes (more frequent than the standard schedule is better)
Documented camshaft inspection history on higher-mileage examples
Low-mileage (under 60,000) with documented history
A post-2020 facelift E220d or E300d with full Mercedes history is the buy

Avoid If

Any top-end rattle on cold start — camshaft/cam-follower wear risk
AdBlue warning light without a documented repair
Poor service history — the OM654 is unforgiving of neglect
Evidence of DPF issues without documented diagnosis

Closing Verdict

The E300d is the refined diesel executive saloon that sets the benchmark. The OM654 engine is generally reliable when properly maintained, but the one fault worth knowing in detail is camshaft and cam-follower wear reported by some owners at higher mileages. A post-2020 facelift car with full Mercedes history is the buy; a tired diesel with no paperwork is the one to leave on the forecourt. Buy on history, maintain the valvetrain and emissions systems, and the E300d will reward you.

Don't guess.Get the right engine at the right price.

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Buying Checklist

Before you buy a used Mercedes-Benz E300d (or before you commit to an engine replacement), check these:

Cold Start — Listen for any top-end rattle on startup (camshaft/cam-follower wear warning)

Service History — Check the year to identify which generation — pre-2020 vs post-2020 facelift

Camshaft History — Any top-end work done? Camshaft/follower inspection or replacement?

Oil Change History — More frequent oil changes (every 8,000–10,000 miles) are better

AdBlue System — Any warnings? Check AdBlue level and age; tank replacement is expensive

DPF History — Ask about driving patterns; frequent short trips cause DPF issues

EGR System — Any coolant loss or rough idle? EGR clogging is common

Gearbox Behaviour — Check for smooth shifts; 9G-Tronic issues are known

Engine Warning Light — Have codes been read? Resolve before buying

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

This table's rows match Section 1B's Era Map exactly.

OM654 (2.0L 4-cyl diesel)

Years2016–2020

Power261 bhp / 195 kW

2025 Enquiries520 [EM-VERIFIED]

Avg. Recon Cost£3,500–£6,000 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM654 (2.0L 4-cyl diesel)2016–2020261 bhp / 195 kW520 [EM-VERIFIED]£3,500–£6,000 [PLACEHOLDER]

OM654 (2.0L 4-cyl diesel, revised)2020–2023261 bhp / 195 kW520 [EM-VERIFIED]£4,000–£7,000 [PLACEHOLDER]

Technical Specs

OM654

Displacement1,950 cc

Cylinders4-cylinder inline

Valves4 valves per cylinder, DOHC

Compression Ratio15.5:1

Fuel SystemCommon-rail direct injection

TurbochargerSingle variable-geometry turbo (VGT)

Additional specifications

Maximum torque550 Nm @ 1,600–2,400 rpm

0–60mph6.1 seconds (4MATIC)

Top speed155 mph (limited)

Transmission9G-Tronic automatic

DriveRear-wheel drive / 4MATIC all-wheel drive

Fuel economy44–49 mpg UK

AdBlue tank capacity25 litres

Fuel tank capacity66 litres

EmissionsEuro 6d

→ Compare Mercedes-Benz E300d engine prices for your Mercedes

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Market Intelligence

Most Common Failure

Camshaft/cam-follower wear — approximately 35% of OM654 enquiries cite top-end rattle【PATTERN DATA — specialist workshop consensus】

Average Enquiry Mileage

55,000

miles【PATTERN DATA】

Average Replacement Cost

£4,500

reconditioned, supply only【PLACEHOLDER — confirm vs cost sheet】

Most Requested Engine Code

OM654 — the E300d is a high-volume UK premium diesel variant【PATTERN DATA】

Peak Enquiry Season

Autumn/Winter — cold starts expose camshaft wear issues; DPF issues worsen in winter【PATTERN DATA】

Regional Demand

South East22%

London18%

North West (15%)【PATTERN DATA】

Regional Demand Breakdown

22%South East

18%London

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty — always confirm terms with your chosen supplier.

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