What are the common problems with the Mercedes-Benz GLE 350 / 450 petrol?

M276 camshaft adjuster and timing chain tensioner wear (rattling on startup, P001685/P001785 codes), M276 oil leaks from timing covers and camshaft position sensors, M256 coolant leaks (subject to a major recall), M256 PCV/oil vapor separator issues, carbon build-up on intake valves (direct injection), and 48V mild-hybrid system complexity. The M276 is generally more proven and reliable than the newer M256.

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

Apply the 70% Mercedes scrap threshold: if your GLE is worth £15,000–£25,000 and a recon engine is £5,000–£7,000 (20–47%), it's worth it. If the vehicle is a tired £10,000 example, the same engine exceeds 50% — get a scrap valuation first. GLEs are luxury SUVs with strong retained value — a good engine rebuild can add significant value if the rest of the car is in good condition.

How do I find my Mercedes-Benz GLE petrol engine code?

The engine code is listed on the VIN plate and vehicle documentation. As a rule of thumb: W166 (2015–2019) GLE 350 is M276 DE35 (3.5L V6, 302 hp); V167 (2020–2025) GLE 450 is M256 E30 (3.0L I6, 362–367 hp with 48V mild hybrid). Tell us your registration date and we'll confirm it for free.

Can I repair the M256 coolant leak, or does the engine need replacement?

The M256 coolant leak is subject to a major recall affecting approximately 8,500 UK vehicles. Repairs are free at authorised Mercedes dealers. The recall identifier is RB-67-2022/23 and targets vehicles manufactured before October 2023. If you notice any warning signs (sweet-smelling vapour, unexplained coolant drops, white residue near hoses), stop driving immediately and check your vehicle using the DVSA recall checker. Continued operation can destroy your engine in under 20 minutes.

Mercedes-Benz GLE 350 / 450 Petrol2015–present2 Engine Generations

Mercedes-Benz GLE 350 / 450 Petrol Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes-Benz GLE 350 / 450 Petrol UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

The GLE 350 and GLE 450 petrol badges span two generations of Mercedes engine — the 3.5-litre V6 M276 and the 3.0-litre inline-six M256 with 48V mild-hybrid technology. Get quotes from trusted UK Mercedes specialists for both eras, supply & fit available nationwide.

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

25+ Specialists

Supply & Fit Available

12-Month Warranty

Nationwide Delivery

25+ Specialists

Mercedes-Benz GLE 350 / 450 Petrol Engines — from £2,500 to £12,000Common codes: M276 DE35, M256 E30

Mercedes-Benz GLE 350 / 450 Petrol Engines — from £2,500 to £12,000· Common codes: M276 DE35, M256 E30

Instant QuotesNo Obligation100% FreeReconditionedRebuiltUsedSupply & Fit AvailableUK-Wide Network

The GLE 350 / 450 PETROL THROUGH TIME — Era Map

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

Era Note

302 hp — robust V6 but oil leaks, cam adjusters and timing chain tensioners need attention

GenerationYearsEngine CodeReliabilityRecon CostEra Note

GLE W166 (350) BMW 320d GLE W166 (350)

2015–2019M276 DE35 (3.5L V6)★★★★☆ [NEWLY ASSIGNED — see Data Note]£3,500–£8,500 [PLACEHOLDER — confirm vs cost sheet]302 hp — robust V6 but oil leaks, cam adjusters and timing chain tensioners need attention

GLE V167 (450) BMW 320d GLE V167 (450)

2020–2025M256 E30 (3.0L I6)★★★★☆ [NEWLY ASSIGNED — see Data Note]£4,500–£12,000 [PLACEHOLDER — confirm vs cost sheet]362–367 hp — smooth I6 with 48V hybrid, but coolant leaks and PCV issues

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 GLE 350 / 450 Petrol Engine Replacement Costs

Supply Only£3,500–£9,000

Fitted (Indie)£4,500–£11,000

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£2,500–£4,500£3,500–£6,5001–6 monthsBudget priority; short-term ownership

Reconditioned Engine£3,500–£9,000£4,500–£11,00012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£5,500–£12,000£6,500–£14,50012–24 monthsLong-term ownership; 3+ year horizon

Main Dealer New£10,000–£15,000£12,000–£18,00024–36 monthsInsurance jobs, warranty claims

Figures above reflect current market rates for GLE petrol engines. Reconditioned engines typically cost £1,200–£2,200 supply only for standard units, but GLE-specific M276 and M256 engines command a significant premium. A full engine replacement can run anywhere between £1,500 and £5,000 depending on your car model and engine type. The M256's 48V mild-hybrid system adds further complexity and cost. M276 units generally sit at the lower end of the range; M256 units command a premium.

Labour estimate: Fitting a GLE petrol engine typically takes 12–16 hours at £65–£95/hr (independent). The M276 V6 requires more labour than simpler engines; the M256's 48V system and complex cooling circuit add additional time.

→ Compare GLE 350 / 450 petrol engine prices from UK specialists

Common Problems

1. M276 Camshaft Adjuster & Timing Chain Tensioner Wear (W166 GLE 350)

Symptoms: Rattling noise on cold start lasting 2–5 seconds, ticking noise, engine warning light (P001685, P001785, P002177, P001177, P001885), rough running, poor performance. The M276 has secondary tensioner oil feed issues — when parked, the oil pressure drains back out and causes rattle for a few seconds until oil pressure returns. The camshaft adjusters can also fail over time.

Typical mileage: 60,000–120,000 miles — rattle often starts around 120k miles; timing chain stretch usually appears after 100–150k km (62,000–93,000 miles).

Repair cost: £1,500–£4,000 (camshaft adjusters, timing chain, tensioners). There is a fix to fit non-return check valves in the oil feed line.

Replacement cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.

🔴 Immediate - if you hear rattling on startup, book an inspection today.

Our recommendation:

The M276's timing chain tensioner and camshaft adjuster issues are well-documented. A bulletin states no damage can be caused and it's just a noise, but ignoring the rattle can lead to more serious timing chain problems. Regular oil changes with the correct specification are essential. At the first sign of rattling on startup, book an inspection immediately — preventative repair is far cheaper than a full engine rebuild.

1. M276 Camshaft Adjuster & Timing Chain Tensioner Wear (W166 GLE 350)

Typical mileage: 60,000–120,000 miles — rattle often starts around 120k miles; timing chain stretch usually appears after 100–150k km (62,000–93,000 miles).

Repair cost: £1,500–£4,000 (camshaft adjusters, timing chain, tensioners). There is a fix to fit non-return check valves in the oil feed line.

Replacement cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.

🔴 Immediate - if you hear rattling on startup, book an inspection today.

Our recommendation:

2. M256 Coolant Leak (V167 GLE 450)

Symptoms: Sweet-smelling vapour from vents or engine bay, unexplained drops in coolant level, white crystalline residue near hoses or coolant rails, dashboard overheating warnings, erratic temperature gauge behaviour. The coolant leak recall affects approximately 8,500 UK vehicles delivered between December 2020 and September 2023.

Typical mileage: Any mileage — the recall affects vehicles manufactured before October 2023.

Repair cost: Covered under recall — free at authorised dealers. If out of warranty, £1,000–£3,000+ depending on damage. Continued operation can destroy the engine in under 20 minutes.

Replacement cost: N/A — repair only if caught early; catastrophic failure requires full engine replacement.

🔴 Immediate - if you spot any of these signs, stop driving immediately.

Our recommendation:

The M256's coolant leak is a serious safety issue. Improper sealing materials degrade prematurely under high temperatures, allowing coolant to escape into sensitive areas. When seals fail, coolant can contaminate sensors, corrode wiring, or cause overheating that warps cylinder heads. Check if your vehicle is affected using the DVSA recall checker. If you notice any warning signs, stop driving immediately and book an inspection.

3. Oil Leaks — Timing Cover & Camshaft Position Sensors (M276)

Symptoms: Visible oil leaks, burning oil smell, low oil level warnings, oil accumulation at the front-lower engine area, electrical malfunctions. Oil can leak from the front upper timing covers, migrate downward and be misidentified as a valve cover or oil pan leak. Oil can also enter the camshaft position sensor and travel through the wiring harness, filling up the ECU, oxygen sensor connectors and other components.

Typical mileage: 60,000–100,000 miles — age-related as seals and gaskets deteriorate.

Repair cost: £500–£2,000 (timing cover reseal, camshaft position sensors, ECU inspection). An unaddressed minor oil leak can spill onto the serpentine belt, causing it to lose tension and potentially be sucked behind the crank pulley — which can knock the oil pump chain off its gear and cause the engine to seize.

Replacement cost: N/A — repair only; if ignored, oil loss can lead to engine damage.

🟠 Check - book inspection urgently if symptoms appear.

Our recommendation:

The M276's oil leaks are one of its "minor common faults", but ignoring them can lead to catastrophic failure. Regular inspection of the oil cooler and prompt replacement of damaged seals can mitigate this problem. If you notice any oil leaks or a burning oil smell, have the system inspected promptly. Accurate diagnosis usually requires a clean-and-inspect approach or UV dye tracing.

Ready to Compare?

Get Matched With a Vetted Mercedes Specialist

25+ vetted Mercedes specialists, each experienced with the GLE petrol range, with a 12-month warranty as standard.

Get My Free GLE 350 / 450 Petrol Engine Quotes Now

GLE 350 / 450 Petrol — 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.

GLE 350 / 450 Petrol — 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 SenseM276 camshaft adjuster/tensioner rattle✅ Yes (if caught early)£1,500–£4,000Non-return check valves can fix oil drain issueM276 oil leaks (timing cover, sensors)✅ Yes£500–£2,000Preventative — catch before belt damage or ECU contaminationM256 coolant leak✅ YesCovered by recallFree at authorised dealers — check DVSA recall checkerM256 PCV/oil separator issues✅ Yes£500–£1,500Common on modern German enginesCatastrophic engine failure❌ Usually NoEngine replacementFull engine replacement required if bottom-end or valvetrain fails

Buying This GLE Petrol? Check These First

Buy If

M276 (W166) with full service history and no cold-start rattle — a robust and proven V6
M256 (V167) with coolant recall completed and no warning signs — a smooth and powerful I6
M276 with timing cover oil leaks already addressed
Full service history with regular oil changes (every 8,000–10,000 miles)

Avoid If

M276 with cold-start rattle — camshaft adjuster or timing chain tensioner issues
M276 with oil leaks or burning oil smell — timing cover leaks are common
M256 with coolant loss or sweet smell — coolant leak recall may not have been addressed
M256 with 48V system warnings — complex and expensive to repair

Closing Verdict

The GLE petrol range spans two generations of Mercedes engines — the M276 V6 (W166, 2015–2019) and the M256 I6 (V167, 2020–2025). The M276 is "one of the most prolific Mercedes-Benz engines" and "so well engineered that they're close enough" to perfect. It has minor common faults — oil leaks, problematic camshaft adjusters and timing chain tensioners — but is fundamentally robust. The M256 is a "really nice straight six" and comparable to BMW's B58, but has coolant leak vulnerabilities (subject to a major recall), PCV system issues and 48V hybrid complexity. With the 70% Mercedes scrap threshold, a £5,000–£7,000 reconditioned engine on a GLE valued at £15,000–£25,000 is 20–47% of the car's value — worth it for a well-maintained example. On a sub-£10,000 example, think carefully.

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

→ Compare GLE 350 / 450 petrol engine prices before you buy

Don't Guess. Compare.

Get real quotes from vetted UK specialists and make the right call for your 320d.

→ Compare GLE 350 / 450 petrol engine prices before you buy

20+ Vetted Specialists UK Network

12-Month Warranty as Standard

Nationwide Delivery & Collection

Transparent Pricing, No Hidden Fees

Thousands of 320d Owners Helped

Buying Checklist

Before you buy a used Mercedes-Benz GLE 350 / 450 Petrol (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling on startup (M276 camshaft adjuster/tensioner warning)

Coolant Level — Check for unexplained drops or sweet smell (M256 coolant leak recall)

Service History — Regular oil changes every 8,000–10,000 miles using MB-approved oil

Oil Leaks — Check around front of engine and timing covers (M276 common)

48V System — Check for any hybrid system warnings (M256 EQ-Boost)

Engine Warning Light — Have codes been read? Any unresolved issues?

Recall Check — Has the M256 coolant recall (RB-67-2022/23) been completed?

MOT History — Check for emissions-related failures

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.

M276 DE35 (3.5L V6)

Years2015–2019

Power302 hp (225 kW)

2025 Enquiries— (pattern data)

Avg. Recon Cost£3,500–£8,500 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M276 DE35 (3.5L V6)2015–2019302 hp (225 kW)— (pattern data)£3,500–£8,500 [PLACEHOLDER]

M256 E30 (3.0L I6)2020–2025362–367 hp (270–270 kW)— (pattern data)£4,500–£12,000 [PLACEHOLDER]

Technical Specs

M256 E30 — V167 GLE 450

Displacement3,498 cc

CylindersV6, 24-valve, 60° bank angle

Compression Ratio12.0:1

Fuel SystemDirect injection

TurbochargerNaturally aspirated

Torque273 lb-ft (370 Nm)

Displacement2,999 cc

CylindersInline-6, 24-valve DOHC

Compression Ratio10.5:1

Fuel SystemDirect injection

TurbochargerSingle turbocharger with electric auxiliary compressor

Torque369 lb-ft (500 Nm)

48V SystemEQ-Boost mild hybrid with integrated starter-generator

→ Compare GLE 350 / 450 petrol engine prices for your Mercedes

Get quotes from trusted UK specialists in minutes.

Market Intelligence

Most Common Failure

M276 camshaft adjuster/tensioner rattle (W166) / M256 coolant leak recall (V167) — generation-dependent 【PATTERN DATA】

Average Enquiry Mileage

65,000

miles 【PATTERN DATA】

Average Replacement Cost

£5,500

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

Most Requested Engine Code

M276 DE35 (W166 GLE 350 — highest-volume generation) 【PATTERN DATA】

Peak Enquiry Season

Autumn/Winter — cold starts expose timing chain and cooling issues 【PATTERN DATA】

Regional Demand

South East24%

London18%

South West (16%) 【PATTERN DATA】

Regional Demand Breakdown

24%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.

Why UK Mercedes-Benz GLE 350 / 450 Petrol Owners Trust MercedesEngine.uk

Trusted GLE 350 / 450 Petrol Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real GLE owners, with specialists who understand the M276's camshaft adjuster and timing chain vulnerabilities and the M256's coolant leak and PCV system issues intimately, across both engine generations.
Compare GLE 350 / 450 Petrol Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit, all from specialists experienced with Mercedes' petrol V6 and straight-six engines and their specific maintenance requirements.
UK Engine Replacement Services for GLE Petrol
supply-only or full supply & fit available nationwide, covering everything from timing chain repair to coolant leak recall work to full engine swaps on your W166 or V167 GLE.

Find the best Mercedes-Benz GLE 350 / 450 petrol engine replacement UK drivers rely on. Compare prices from trusted specialists on MercedesEngine.uk today and get your GLE back on the road with confidence.

Compare Mercedes-Benz GLE 350 / 450 Petrol Engine Prices Now

100% Free

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

100% Free

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