Is the Mercedes‑Benz GLE250d / GLE300d engine reliable?

It depends on the generation. The OM651 (W166, 2015–2019) is rated ★★½☆☆ — in the heavy GLE, the engine works harder and engine bay temperatures run hotter. 72% of turbo failures occur between 75,000–95,000 miles, and timing chain stretch is a well‑documented weakness. The OM654 (V167, 2019–present) is rated ★★★☆☆ — more modern but has valvetrain wear, AdBlue system faults, and a coolant pump recall.

What are the common problems with the Mercedes‑Benz GLE250d / GLE300d?

OM651 turbocharger failure (72% between 75k–95k miles), timing chain stretch, oil cooler seal leaks, piezo injector failure, and oil leaks from the turbo and main seal. OM654 valvetrain wear (camshafts and tappets), rocker arm bearing failure, AdBlue system faults (NOx sensors, AdBlue injector), and a coolant pump vacuum circuit recall.

Is it worth replacing a Mercedes‑Benz GLE250d / GLE300d engine, or should I scrap the car?

Depends on vehicle value and generation. Against a well‑kept V167 GLE300d worth £25,000–£40,000, a £3,500–£8,500 recon is a manageable 9–34% of the vehicle's value — worth it for a well‑maintained example. For a W166 GLE250d worth £8,000–£15,000, a £4,500 recon is more marginal.

How do I find my Mercedes‑Benz GLE250d / GLE300d engine code?

Listed on the VIN plate and vehicle documentation. The GLE250d uses OM651 (W166 2015–2019); the GLE300d uses OM654 (V167 2019–present). Tell us your registration date and we'll confirm it for free.

Can I repair the OM651's timing chain, or does it need a new engine?

Yes — if caught early. A timing chain and tensioner replacement (£1,500–£3,500) is far cheaper than a catastrophic chain snap (£2,500–£5,500 engine replacement). At the first sign of cold‑start rattle, book an inspection immediately. The chain sits on the transmission side of the engine, so it's an engine‑out job, but it's far cheaper than a new engine.

Mercedes-Benz GLE250d / GLE300d2015–present2 Engine Generations

Mercedes-Benz GLE250d / GLE300d Engine Replacement — Compare Prices & Get Quotes

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Mercedes GLE Diesel Engines — from £2,000 to £8,500Common codes: OM651, OM654

Mercedes GLE Diesel Engines — from £2,000 to £8,500· Common codes: OM651, OM654

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The GLE250d / GLE300d THROUGH TIME — Era Map

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

Era Note

The OM651 in the heavy GLE — timing chain stretch, turbo failure at 80k miles, and oil cooler leaks are the defining weaknesses.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

W166 (GLE250d) BMW 320d W166 (GLE250d)

2015–2019OM651 (2.1 CDI — 204 bhp)★★½☆☆ [NEWLY ASSIGNED — see Data Note]£2,500–£5,500 [MB‑QUOTE]The OM651 in the heavy GLE — timing chain stretch, turbo failure at 80k miles, and oil cooler leaks are the defining weaknesses.

V167 (GLE300d) BMW 320d V167 (GLE300d)

2019–presentOM654 (2.0 CDI — 245 bhp)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£3,500–£8,500 [MB‑QUOTE]The modern OM654 — valvetrain wear, AdBlue system faults, and potential coolant pump leaks are the main watchpoints.

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes-Benz GLE250d / GLE300d Engine Replacement Costs

Supply Only£3,000–£6,000

Fitted (Indie)£4,000–£7,300

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,000–£4,000£2,800–£5,2003–6 monthsBudget priority; vehicle under £8,000

Reconditioned Engine£3,000–£6,000£4,000–£7,30012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£4,500–£8,500£5,500–£9,70012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£10,000–£15,000£11,500–£17,00024–36 monthsInsurance jobs, warranty claims

Labour estimate: Fitting a GLE diesel engine typically takes 12–16 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). Timing chain replacement on the OM651 is an engine‑out job, significantly increasing labour costs.

Common Problems

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Mercedes-Benz GLE250d / GLE300d — 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 GLE250d / GLE300d — 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 SenseOM651 turbocharger failure✅ Yes£1,500–£3,500Replace turbo; 72% fail between 75k–95k miles — catch it earlyOM651 timing chain stretch✅ Yes£1,500–£3,500If caught early; engine‑out job but cheaper than replacementOM651 oil cooler seal leak✅ Yes£800–£1,200Labour‑intensive but straightforward; catch it before oil loss causes damageOM651 piezo injector failure✅ Yes£400–£1,200Replace failed injectors with Delphi or Bosch unitsOM654 valvetrain wear✅ Yes£1,500–£3,500Cylinder head work required; catch it before camshaft failureOM654 AdBlue system failure✅ Yes£500–£1,500Replace NOx sensors, pump or injector; don't let countdown expireOM654 coolant pump/vacuum leak✅ YesRecallCheck recall status — free dealer repair

Buying This GLE Diesel? Check These First

Buy If

Full Mercedes service history with documented oil changes (more frequent than manufacturer recommendation)
Post‑2019 OM654 — generally more refined than the OM651
Evidence of turbocharger replacement on OM651 cars (especially 75k–95k mile examples)
No AdBlue system issues (V167) or evidence of NOx sensor replacement
Coolant pump recall work completed (OM654)

Avoid If

OM651 with turbo noise or power loss — 72% fail between 75k–95k miles
Cold‑start rattle with no timing chain history (OM651) — the single most important check
Cold‑start misfire or ticking (OM654) — potential valvetrain wear
AdBlue countdown active (V167) — potential system failure
Poor service history on any generation

Closing Verdict

The GLE250d / GLE300d is a premium mid‑size SUV that offers refinement, space and excellent fuel economy. But the engine choice determines your ownership experience. The OM651 (W166, 2015–2019) is worked harder in the heavy GLE than in lighter models — engine bay temperatures run hotter, accelerating wear. Turbo failure between 75,000–95,000 miles is a well‑documented weakness, along with timing chain stretch, oil cooler leaks, and injector failure. The OM654 (V167, 2019–present) is more modern but has valvetrain wear, AdBlue system faults, and a coolant pump recall. Buy on documented history, and if you're looking at an OM651, be prepared for potential turbo and chain work. If you're replacing, a reconditioned unit with a 12‑month warranty is the sweet spot.

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Buying Checklist

Before you buy a used Mercedes‑Benz GLE250d / GLE300d (or before you commit to an engine replacement), check these:

Turbo Health — Test acceleration; any loss of power, whistling, or grinding? 72% of OM651 turbos fail between 75k–95k miles

Cold Start — Listen for rattling noise on startup (OM651 timing chain warning) or misfire/judder (OM654 valvetrain wear)

Service History — Including which engine era (OM651 for W166 2015–2019, OM654 for V167 2019–present) — see the Era Map above

Oil Leaks — Check for oil spots under the car or in the engine bay — OM651 oil cooler leaks and turbo oil leaks are common

AdBlue System — Any AdBlue warnings? Countdown active? NOx sensor or pump failure (V167)

Coolant Pump Recall — Has the OM654 coolant pump/vacuum circuit recall been completed?

Fuel Pump ECU — Check for water ingress in the spare wheel well — can damage the fuel pump control unit

Engine Warning Light — Have codes been read? Any unresolved turbo, timing, injector, or emissions issues?

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

OM651 (651.9xx)

Years2015–2019

Power204 bhp / 500 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£2,500–£5,500 [MB‑QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM651 (651.9xx)2015–2019204 bhp / 500 Nm— (pattern data)£2,500–£5,500 [MB‑QUOTE]

OM654 (654.9xx)2019–present245 bhp / 500 Nm— (pattern data)£3,500–£8,500 [MB‑QUOTE]

Technical Specs

OM654 — representative

Displacement2,143cc

Cylinders4‑cylinder inline

Compression Ratio16.2:1

Fuel SystemCommon‑rail direct injection

TurbochargerSingle variable geometry turbo (VGT)

Timing DriveSimplex chain (transmission side)

Displacement1,950cc

Cylinders4‑cylinder inline

Compression Ratio15.5:1

Fuel SystemCommon‑rail direct injection

TurbochargerSingle variable geometry turbo (VGT)

Timing DriveChain (transmission side)

Market Intelligence

Most Common Failure

OM651 turbocharger failure (72% between 75k–95k miles) and timing chain stretch; OM654 valvetrain wear and AdBlue system faults

Average Enquiry Mileage

62,000

miles

[PATTERN DATA]

Average Replacement Cost

£4,500

reconditioned, supply only

[MB‑QUOTE]

Most Requested Engine Code

OM651

[MB‑VERIFIED]

Peak Enquiry Season

Winter — cold starts expose timing chain and valvetrain issues

[PATTERN DATA]

Regional Demand

London22%

South East20%

Midlands15%

PATTERN DATA

Regional Demand Breakdown

22%London

20%South East

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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No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available