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“Thanks to EngineMarket, I saved over £1,200 on my engine replacement and got matched with a great local specialist within the hour.”
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Mercedes Benz GLE Class Engine ReplacementCompare Prices & Save
Get quotes today from trusted UK Mercedes Benz GLE Class engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available.
GLE Class Diesel Engines - from £2,000 to £6,500
-> Rebuilt units from £3,200 · Common codes: OM642, OM656, OM654
GLE Class Petrol Engines - from £1,800 to £5,500
-> Rebuilt units from £2,800 · Common codes: M276, M256, M274
GLE Class AMG Engines - from £5,000 to £12,000
-> Rebuilt units from £5,800 · Common codes: M177, M176, M256 (AMG 53)
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3 Simple Stepsto Finding the Best Mercedes Benz GLE Class Replacement Engine
Get Instant Quotes from Mercedes - Benz Engine Specialists Across the UK - 100% free, no obligation. Most replacements completed within 3-5 days.
Most replacements completed within 3-5 days.
12-Month Warranty
Supply & Fit Available
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Live UK Engine Market Data
What Are UK Drivers Paying for Mercedes Benz GLE Class Engine Replacement?
The table below shows typical UK rebuilt engine costs across Mercedes Benz GLE Class variants, covering documented failure causes, chassis generations, engine codes, and fuel types based on current market data.
Average Market Prices
- Mercedes Benz GLE Class (W167) 53 AMG2019-2025£5,500-£9,000High-voltage starter failM256MHEV Petrol 3.0L
- Mercedes Benz GLE Class (W167) 63 S AMG2019-2025£8,000-£14,000Cylinder bore wearM177Petrol 4.0L
- Mercedes Benz GLE Class (W167) 350de2020-2025£5,000-£7,500High-voltage battery failOM654PHEV Diesel 2.0L
- Mercedes Benz GLE Class (W167) 400e2020-2025£5,000-£7,800Hybrid system faultM274PHEV Petrol 2.0L
- Mercedes Benz GLE Class (W166) 250d2015-2019£2,200-£2,600Timing chain wearOM651Diesel 2.1L
- Mercedes Benz GLE Class (W166) 350d2015-2019£3,200-£4,500Turbo oil seal failOM642Diesel 3.0L
- Mercedes Benz GLE Class (W166) 4002015-2019£3,200-£4,000Balance shaft wearM276Petrol 3.0L
- Mercedes Benz GLE Class (W166) 3502015-2019£2,800-£3,800Timing chain guide wearM276Petrol 3.5L
- Mercedes Benz GLE Class (W166) 63 AMG2015-2019£6,500-£10,000Cylinder bore scoringM157Petrol 5.5L
- Mercedes Benz GLE Class (W167) 300d2019-2025£2,500-£3,800EGR valve failureOM654Diesel 2.0L
- Mercedes Benz GLE Class (W167) 350d2019-2023£4,000-£5,800EGR cooler cracksOM656Diesel 2.9L
- Mercedes Benz GLE Class (W167) 400d2019-2025£5,500-£6,800Turbo bearing wearOM656Diesel 2.9L
- Mercedes Benz GLE Class (W167) 4502019-2025£4,500-£7,00048V starter failM256MHEV Petrol 3.0L
Last updated: 22 May, 14:59
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Models We Cover
Mercedes Benz GLE Class Engine ReplacementAll Variants Covered
From the efficient GLE 300d to the high‑performance GLE 63 S AMG, our network of UK Mercedes Benz GLE Class engine specialists helps you compare rebuilt, reconditioned and used engine prices. Typical price range for a rebuilt unit with a 12‑month warranty is £2,000‑£7,000 - supply & fit available nationwide.
Core Diesel Range
Specs245hp
Years2019-2025
Rebuilt£2,500-£3,800
Core Petrol Range
PHEV & Specialist
AMG Performance Range
Variant Directory
Diesel Variants
GLE 250dGLE 300dGLE 350dGLE 350deGLE 400d
Petrol Variants
GLE 350GLE 400GLE 400eGLE 450GLE 580Performance & AMG VariantsGLE 43 AMGGLE 53 AMGGLE 63 AMGGLE 63 S AMGNot sure which variant your Mercedes Benz GLE Class is? Enter your registration number above - we’ll identify the exact sub‑model, engine code and compatible replacement options instantly.
Engine Codes
Mercedes Benz GLE Class Engine CodesFull Technical Specifications & Replacement Guide
Every engine code fitted to the Mercedes Benz GLE Class across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.
Diesel Engines
Extracted from detailed diesel engine families across Mercedes Benz GLE Class variants.
Petrol Engines
Extracted from detailed petrol and performance engine families across Mercedes Benz GLE Class variants.
Hybrid / Electrified Engines
Extracted from electrified powertrains and hybrid engine families used in Mercedes Benz GLE Class variants.
Can't find your engine code?
Common Problems
Mercedes Benz GLE Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense
The Mercedes Benz GLE Class spans two generations - W166 (2015-2019) and W167 (2019-present) - with distinct engine families carrying their own failure patterns. Diesel variants dominate UK demand, particularly the OM642 V6 in the 350d and the OM656 inline-six in the 400d, while petrol models face timing chain vulnerabilities across M276 V6 units . Every rebuilt engine supplied through EngineMarket includes upgraded internal components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common GLE engine failures, what repair costs look like at dealer vs specialist rates, and when replacement is the smarter financial decision.
Every rebuilt engine includes a minimum 12-month unlimited mileage warranty.
1. OM642 V6 Diesel Timing Chain & Turbo Oil Seal Failure
Why W166 GLE 350d Engines Fail
Affected Models
Mercedes Benz GLE Class 350d, GLE 350d 4MATIC (2015-2019, OM642 V6 diesel)
Typical Failure Mileage
Turbo oil seal 60,000-90,000 miles; Timing chain tensioner wear 80,000-120,000 miles
Root Cause
The OM642 V6 diesel suffers from two primary failure modes. The turbocharger oil seal degrades, allowing engine oil to enter the exhaust - producing blue/white smoke and eventually catastrophic turbo failure. Simultaneously, the timing chain tensioner can lose hydraulic pressure, particularly on higher-mileage units, leading to chain rattle and potential jumping of timing if ignored .
Repair Options & Estimated Costs (UK ranges)
| Repair Tier | Dealer Price | Specialist Price | What It Involves | Longevity / Suitability |
|---|---|---|---|---|
Minor - Turbo Oil Seal Replacement Minor | £650 - £950 | £350 - £550 | Replace turbo oil seal, inspect turbo shaft play, clean EGR system | Addresses smoking issue; only suitable if turbo bearings are intact |
Intermediate - Full Turbocharger Replacement Intermediate | £1,800 - £2,500 | £1,100 - £1,600 | New or reconditioned turbocharger, oil seal, feed lines, gaskets | Resolves oil consumption and power loss; lasts 60k+ miles |
Major - Timing Chain & Tensioner Replacement Minor | £1,500 - £2,200 | £900 - £1,400 | Replace timing chain, tensioner, guides, camshaft sprockets | Essential if chain rattle present; prevents catastrophic engine failure |
Full Replacement - Rebuilt OM642 Engine Best Value | £5,500 - £7,500 | £3,200 - £4,500 | Supply & fit reconditioned OM642 with upgraded internal components, 12-month warranty | The only reliable solution if chain has jumped or turbo debris has entered engine |
Our Recommendation
Best next step for om642 v6 diesel timing chain & turbo oil seal failure
For smoking exhaust without loss of power, start with the turbo oil seal replacement at a specialist - the £350-£550 cost is a fraction of a full replacement. However, if you hear timing chain rattle on cold start, do not delay. Chain failure on an OM642 typically writes off the engine, with debris circulating through the oil system. On a GLE 350d worth £12,000-£18,000, a £1,100 specialist timing chain job is excellent preventative maintenance. If the engine has already suffered catastrophic failure, a rebuilt OM642 from a specialist is your most cost-effective route - dealer pricing for a new engine is economically unviable.
Don't Let Engine Failure Write Off Your Mercedes Benz GLE Class
A failed engine doesn't have to mean the end of your GLE. Whether you own a W166 350d with a smoking OM642 turbo or a W167 53 AMG with 48V system failure, EngineMarket makes it simple to compare prices from trusted UK Mercedes Benz GLE Class specialists. Every rebuilt engine we connect you with includes upgraded components designed to address the original failure point - metal timing guides instead of plastic, reinforced turbo cartridges, and proper EGR cooling solutions. With 12-month warranties, nationwide delivery, and supply & fit available across the UK, you can get back on the road without the main dealer premium.
Compare Mercedes Benz GLE Class Engine Replacement Prices Now →Mercedes Benz GLE Class Engine Problems
What It Costs to Fix & When Replacement Makes Sense
The Mercedes Benz GLE Class spans two generations - W166 (2015-2019) and W167 (2019-present) - with distinct engine families carrying their own failure patterns. Diesel variants dominate UK demand, particularly the OM642 V6 in the 350d and the OM656 inline-six in the 400d, while petrol models face timing chain vulnerabilities across M276 V6 units . Every rebuilt engine supplied through EngineMarket includes upgraded internal components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common GLE engine failures, what repair costs look like at dealer vs specialist rates, and when replacement is the smarter financial decision.
Affected Models
Mercedes Benz GLE Class 350d, GLE 350d 4MATIC (2015-2019, OM642 V6 diesel)
Typical Failure Mileage
Turbo oil seal 60,000-90,000 miles; Timing chain tensioner wear 80,000-120,000 miles
Root Cause
The OM642 V6 diesel suffers from two primary failure modes. The turbocharger oil seal degrades, allowing engine oil to enter the exhaust - producing blue/white smoke and eventually catastrophic turbo failure. Simultaneously, the timing chain tensioner can lose hydraulic pressure, particularly on higher-mileage units, leading to chain rattle and potential jumping of timing if ignored .
Minor - Turbo Oil Seal Replacement
Dealer
£650 - £950
Specialist
£350 - £550
Replace turbo oil seal, inspect turbo shaft play, clean EGR system
Addresses smoking issue; only suitable if turbo bearings are intact
Intermediate - Full Turbocharger Replacement
Dealer
£1,800 - £2,500
Specialist
£1,100 - £1,600
New or reconditioned turbocharger, oil seal, feed lines, gaskets
Resolves oil consumption and power loss; lasts 60k+ miles
Major - Timing Chain & Tensioner Replacement
Dealer
£1,500 - £2,200
Specialist
£900 - £1,400
Replace timing chain, tensioner, guides, camshaft sprockets
Essential if chain rattle present; prevents catastrophic engine failure
Full Replacement - Rebuilt OM642 Engine
Dealer
£5,500 - £7,500
Specialist
£3,200 - £4,500
Supply & fit reconditioned OM642 with upgraded internal components, 12-month warranty
The only reliable solution if chain has jumped or turbo debris has entered engine
Our Recommendation
Best next step for om642 v6 diesel timing chain & turbo oil seal failure
For smoking exhaust without loss of power, start with the turbo oil seal replacement at a specialist - the £350-£550 cost is a fraction of a full replacement. However, if you hear timing chain rattle on cold start, do not delay. Chain failure on an OM642 typically writes off the engine, with debris circulating through the oil system. On a GLE 350d worth £12,000-£18,000, a £1,100 specialist timing chain job is excellent preventative maintenance. If the engine has already suffered catastrophic failure, a rebuilt OM642 from a specialist is your most cost-effective route - dealer pricing for a new engine is economically unviable.
Don't Let Engine Failure Write Off Your Mercedes Benz GLE Class
A failed engine doesn't have to mean the end of your GLE. Whether you own a W166 350d with a smoking OM642 turbo or a W167 53 AMG with 48V system failure, EngineMarket makes it simple to compare prices from trusted UK Mercedes Benz GLE Class specialists. Every rebuilt engine we connect you with includes upgraded components designed to address the original failure point - metal timing guides instead of plastic, reinforced turbo cartridges, and proper EGR cooling solutions. With 12-month warranties, nationwide delivery, and supply & fit available across the UK, you can get back on the road without the main dealer premium.
Compare Mercedes Benz GLE Class Engine Replacement Prices Now →Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EngineMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Mercedes Benz GLE Class and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
12-Month Warranty
Upgraded Components
Nationwide UK Delivery
Save vs Main Dealer Price
Replacement Engine Options
Mercedes Benz GLE Class Engine TypesOptions, Costs & What to Expect
Every engine type is available through our UK network with typical price ranges based on variant, engine code and budget.
All engine types include a minimum 12‑month unlimited mileage warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Mercedes Benz GLE Class within hours.
Engine Sizes
Mercedes Benz GLE Class Engines by SizeFind the Right Displacement for Your Variant
Every displacement fitted to the GLE Class across W166 and W167 generations is listed below, with compatible engine codes, years and common failure notes.
Mercedes Benz GLE Class Diesel Engine Sizes
The 2.0-litre four-cylinder diesel arrived with the W167 generation in 2019, replacing the older OM651 2.1-litre unit. Using Mercedes’ modular OM654 architecture with stepped bowl combustion and a variable geometry turbo, this engine offers 245hp in GLE 300d guise - remarkably high output for a four-cylinder diesel in this segment. It provides the entry point to the diesel GLE range, balancing respectable economy with sufficient power for a large premium SUV.
| Engine Code(s) | OM654 (2019-2025) |
| Compatible Models (UK) | GLE 300d, GLE 300d 4MATIC |
| Production Years | W167, 2019-2025 |
Common Failure Points
Watch for these known weak points
EGR valve, cooler clogging, coolant pump vacuum circuit leaks, camshaft position sensor failure causing intermittent stalling
Not sure which engine size your Mercedes Benz GLE Class needs? Enter your registration number above - we’ll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12‑month unlimited mileage warranty from UK Mercedes Benz GLE Class specialists.
Mercedes Benz GLE Class Engines Fuel Type
Mercedes Benz GLE Class Engines by Fuel Type
Choose your Mercedes Benz GLE Class engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the economical GLE 300d to the fire-breathing GLE 63 S AMG.
Mercedes Benz GLE Class Diesel Engines
Mercedes Benz GLE Class Diesel Engines
Diesel engines dominate UK GLE replacement enquiries, spanning the OM651 four-cylinder in W166 250d models through to the OM642 V6 in the 350d and the advanced OM656 inline-six in W167 400d variants.
Common Engine Families
OM651 - 2.1-litre four-cylinder, entry-level W166 GLE 250d, known for timing chain stretch at higher mileage
OM642 - 3.0-litre V6, backbone of W166 GLE 350d, notorious for turbo oil seal failure and smoking exhaust
OM654 - 2.0-litre four-cylinder, modern modular diesel in W167 GLE 300d, EGR clogging issues
OM656 - 2.9-litre inline-six, premium diesel in W167 GLE 350d and 400d, EGR cooler cracks subject to recall
Found In
W166 (2015-2019) - OM651 (250d), OM642 (350d)
W167 (2019-2025) - OM654 (300d), OM656 (350d, 400d)
Known For
Strong motorway torque and genuine long-distance towing capability
OM642 turbo oil seal failure causing blue/white smoke from 60k miles
OM656 EGR cooler cracks leading to coolant loss and fire risk recalls
High UK replacement demand on GLE 350d (OM642) and 400d (OM656)
Typical Models (UK)
GLE 250d
GLE 300d
GLE 350d
GLE 400d
Not sure which fuel type your Mercedes Benz GLE Class has? Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12‑month unlimited mileage warranty from UK Mercedes Benz GLE Class specialists.
Engine Years
Mercedes Benz GLE Class Engines by YearWhat Was Fitted & When
From the 2011 ML-Class launch through the 2015 GLE rebrand to today‘s W167, this section maps every major engine change so you can identify your exact unit and compare rebuilt prices from UK specialists.
2011-2015 - W166 M‑Class Launch
Major Platform Change
The W166 M‑Class launched in late 2011 as the third-generation ML, bringing Euro 6 diesel compliance and a new family of V6 petrol engines before the 2015 rebrand to GLE.
Key Changes
All‑new platform with 7G‑Tronic Plus gearbox across all models
First four‑cylinder diesel (OM651) in an ML - 204hp with 500Nm torque
M276 V6 petrol engines replace older M272 units with direct injection
M157 5.5‑litre V8 biturbo powers the ML 63 AMG flagship
Known For
OM651 timing chain stretch is the most common failure on early cars
OM642 suffers oil cooler leaks and swirl flap failures at higher mileages
M276 balance shaft issues began appearing on later V6 units
7G‑Tronic Plus is robust but must be serviced every 60k miles
Main Engines
OM651 - 2.1 litre diesel (ML 250 BlueTEC)
OM642 - 3.0 litre V6 diesel (ML 350 BlueTEC)
M276 DE35 - 3.5 litre V6 petrol (ML 350)
M278 - 4.7 litre V8 biturbo petrol (ML 500)
M157 - 5.5 litre V8 biturbo petrol (ML 63 AMG)
Popular Models
ML 250 BlueTEC 4MATIC
ML 350 BlueTEC 4MATIC
ML 350 4MATIC
ML 63 AMG
Engine Codes Covered
OM651OM642M276 DE35M278M157
Common Replacement Enquiries
OM642 oil cooler leak repair
ML 350 BlueTEC turbo failure
M276 timing chain replacement cost
Get quotes for 2011-2015 Mercedes Benz GLE Class replacement engines
2011-2015 - W166 M‑Class Launch
Major Platform Change
The W166 M‑Class launched in late 2011 as the third-generation ML, bringing Euro 6 diesel compliance and a new family of V6 petrol engines before the 2015 rebrand to GLE.
Key Changes
All‑new platform with 7G‑Tronic Plus gearbox across all models
First four‑cylinder diesel (OM651) in an ML - 204hp with 500Nm torque
M276 V6 petrol engines replace older M272 units with direct injection
M157 5.5‑litre V8 biturbo powers the ML 63 AMG flagship
Known For
OM651 timing chain stretch is the most common failure on early cars
OM642 suffers oil cooler leaks and swirl flap failures at higher mileages
M276 balance shaft issues began appearing on later V6 units
7G‑Tronic Plus is robust but must be serviced every 60k miles
Main Engines
OM651 - 2.1 litre diesel (ML 250 BlueTEC)
OM642 - 3.0 litre V6 diesel (ML 350 BlueTEC)
M276 DE35 - 3.5 litre V6 petrol (ML 350)
M278 - 4.7 litre V8 biturbo petrol (ML 500)
M157 - 5.5 litre V8 biturbo petrol (ML 63 AMG)
Engine Codes Covered
OM651OM642M276 DE35M278M157
Popular Models
ML 250 BlueTEC 4MATIC
ML 350 BlueTEC 4MATIC
ML 350 4MATIC
ML 63 AMG
Common Replacement Enquiries
OM642 oil cooler leak repair
ML 350 BlueTEC turbo failure
M276 timing chain replacement cost
Get quotes for 2011-2015 Mercedes Benz GLE Class replacement engines
Year Finder
Not sure which year your Mercedes Benz GLE Class was built?
Not sure which year your Mercedes Benz GLE Class was built? Enter your registration number and we‘ll identify the exact engine, model year, and compatible replacement options instantly - all backed by a minimum 12‑month warranty from UK Mercedes Benz GLE Class specialists.
FAQ
Mercedes Benz GLE Class Engine ReplacementFrequently Asked Questions
Question 1
How much does a Mercedes Benz GLE Class engine replacement cost in the UK?
Rebuilt GLE engine prices range from £2,200 for a 250d OM651 unit to over £10,000 for an AMG V8. Supply-only recon engines typically cost £3,200-£6,800 depending on engine code.
Key points
- • OM651 (250d): £2,200-£2,600 for a reconditioned unit
- • OM642 (350d): £3,200-£4,500 for V6 diesel recon
- • OM656 (400d): £5,500-£6,800 due to complex twin-turbo design
- • M276 V6 petrol: £3,200-£4,000, but verify balance shaft history first
- • Dealer fitted prices add £1,500-£3,000 in labour vs specialist supply & fit
Question 2
What are the most common Mercedes Benz GLE Class engine problems by engine code?
OM642 V6 diesel turbos fail from oil seal leaks (£350-£1,600 repair). M276 V6 petrol timing chain guides wear (£1,200-£1,800 specialist fix). OM656 EGR coolers crack (recall affected 2019-2024 models).
Key points
- • OM642: Turbo oil seal failure causes blue/white smoke at 60k-90k miles
- • M276: Balance shaft and plastic timing chain guide wear from 80k miles
- • OM656: EGR cooler cracks prompt fire risk recall across 2017-2021 diesel models
- • OM651: Timing chain stretch on 250d units at 80k-100k miles
- • M256: 48V starter-generator failures immobilise GLE 450 and 53 AMG
Question 3
Is it worth replacing the engine in my Mercedes Benz GLE Class?
On a GLE worth £12,000-£18,000 with OM642 or OM651 failure, specialist replacement at £3,200-£4,500 is usually worthwhile. On older high-mileage W166 petrol models, weigh repair costs against vehicle value.
Key points
- • GLE 250d/350d (W166) with body mileage under 120k: replacement makes sense
- • One forum owner faced £26k-£28k dealer quote vs £33k vehicle value - specialist saved 30-40%
- • M276 petrol replacement at £3,200-£4,000 viable for GLE 400 worth £10k-£15k
- • Dealer long block + labour = £20k+; specialist recon + fit = £4k-£7k
- • Get independent shop quotes before committing to dealer pricing
Question 4
Which Mercedes Benz GLE Class engine is the most reliable?
The OM642 V6 diesel in GLE 350d (2015-2019) is widely considered the most reliable GLE engine when properly maintained, despite known turbo oil seal issues. The OM654 in GLE 300d is also solid but watch for EGR clogging.
Key points
- • OM642: Robust V6 with generous torque - best balance of reliability and running costs
- • OM651 four-cylinder diesel: Decent but timing chain needs monitoring after 180,000 km
- • M276 petrol V6: Very smooth and free from diesel DPF/EGR issues, but timing chain risk exists
- • M157 AMG V8: Reliable if maintained but very high running costs
- • Best used buy: GLE 350 CDI (OM642) - durable, enjoyable and reliable
Question 5
What causes OM642 turbo failure on my Mercedes Benz GLE 350d?
The turbo oil seal degrades from heat cycling, allowing engine oil to enter the exhaust. This produces blue/white smoke and can lead to complete turbo failure. Boost pressure actuator issues also cause intermittent limp mode.
Key points
- • Failed turbo oil seal is the primary cause of smoking exhaust on OM642
- • Boost pressure regulator (actuator) can cause jerking under heavy acceleration
- • Intermittent codes like 2510 appear without check engine light
- • Actual boost values fluctuating between 34-90% indicates actuator wear
- • Replacement cost: £350-£550 for seal-only, £1,100-£1,600 for full turbo
Question 6
How long does a Mercedes Benz GLE Class engine last?
Well-maintained OM642 and OM656 diesel GLE engines regularly exceed 150,000-200,000 miles. Petrol M276 V6 units typically reach 120,000-150,000 miles with proper timing chain maintenance. M256 mild hybrid longevity less proven.
Key points
- • OM642 V6 diesel: 150k-200k+ miles with regular servicing
- • OM651 four-cylinder: 120k-150k miles before timing chain attention needed
- • M276 V6 petrol: 120k-150k miles but timing chain guides are the weak point
- • Service interval is 12 months or 15,500 miles - do not extend
- • High-mileage OM642 examples running strong at 20,000+ miles per year
Question 7
Should I buy a petrol or diesel Mercedes Benz GLE Class?
Diesel (OM642/OM656) is better for high-mileage motorway driving with 30-35mpg achievable. Petrol (M276) suits lower-mileage urban use but returns just 8-9 km/l (approx 22-25mpg). Diesel replacement demand is significantly higher in the UK.
Key points
- • Diesel GLE 350d/400d: Superior torque and towing capability, 30-35 mpg motorway
- • Petrol GLE 350/400: Smoother, quieter, no DPF/EGR diesel issues but fuel consumption high
- • Urban petrol drivers report approximately 8.9 km/l fuel economy
- • Petrol engines simpler to maintain but fuel costs add up for high-mileage users
- • GLE 350 CDI recommended as the best all-rounder for reliability and economy
Question 8
What is the 48V mild hybrid system on Mercedes Benz GLE 450 and 53 AMG?
The M256 engine uses a 48V integrated starter-generator (ISG) and lithium-ion battery for electric boost and coasting. When the 48V battery fails, the vehicle won't start and requires specialist replacement costing £1,800-£2,500.
Key points
- • 48V system provides EQ Boost: extra 22hp and torque assistance
- • Also powers the electric auxiliary compressor for lag-free turbo response
- • Failed 48V battery leaves the car completely immobilised - no jump start possible
- • Replacement requires Mercedes XENTRIS diagnostics and coding
- • Dealer pricing £2,200-£3,500; specialists typically £1,800-£2,500
Question 9
Does Mercedes Benz GLE Class timing chain replacement need doing? How much does it cost?
Yes, the M276 petrol V6 has plastic timing chain guides that degrade from 80,000 miles. Replacement cost is £1,200-£1,800 at a specialist versus £1,800-£2,600 at a dealer. Cold start rattle is the classic warning sign.
Key points
- • M276 V6 uses a timing chain, not a belt - but plastic guides fail
- • Genuine Mercedes timing chain part number 276-050-24-16 for M276 engines
- • Cold start rattle indicates tensioner or guide wear
- • Ignoring rattle leads to timing jump and piston-valve contact
- • Preventative replacement saves £2,000+ vs full engine replacement
Question 10
Can I fit a GLE 63 AMG engine into my standard Mercedes Benz GLE?
Theoretically possible but prohibitively expensive. The M177 V8 requires different engine mounts, gearbox, cooling system, wiring harness, ECU, and transmission. Most specialists advise selling your GLE and buying an AMG instead.
Key points
- • Different engine mounts, subframe, and transmission required
- • Entire wiring harness and all ECUs must be swapped
- • Cooling system is completely different on V8 models
- • Brakes, suspension, and exhaust all need upgrading
- • Labour alone often exceeds £10,000 plus parts
Why Choose Us
Why UK Mercedes Benz GLE Class Owners Trust EngineMarket
Join thousands of UK drivers who compare Mercedes Benz GLE Class engine prices through our network of trusted specialists - every rebuilt and reconditioned unit backed by a minimum 12‑month unlimited mileage warranty and nationwide delivery.
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