Engine Finders

Mercedes-Benz SLC Specialists

Expert Solutions for Every SLC – SLC 180 to SLC 43 AMG

Need a reliable replacement engine for your Mercedes-Benz SLC?
Engine Finders specializes in SLC engines with solutions for M270/M274 petrol and OM651 diesel failure patterns across all variants.

Find Your Perfect Mercedes-Benz SLC Engine Today!
Mercedes-Benz SLC engine replacement specialists | Engine Finders

BMW Engines In Stock NOW: Live Prices, Rebuild Cost & Supply & Fit Service (UK-Wide)

Check REAL-TIME stock availability for all BMW models. View exact rebuild costs, professional engine works & find a certified garage near you - all with 12-month warranty, MoT-ready units, and same-day dispatch.

Mercedes-Benz SLC Replacement Engines Options - Verified Units (UK Supply)

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for R172.

Mercedes-Benz SLC Rebuilt Engines

Includes updated timing chain tensioners for M274/M270 engines prone to rattle.

Mercedes-Benz SLC Remanufactured Engines

Fully disassembled and rebuilt to factory tolerances for R172 M274 engines.

Mercedes-Benz SLC Reconditioned Engines

Restored to operational condition with wear components replaced as needed.

Mercedes-Benz SLC Replacement Engines

Plug-and-play units matching original R172 engine specs for quick swap.

Mercedes-Benz SLC Refurbished Engines

Performance-tuned with upgraded oil pump gears for M270 reliability.

Mercedes-Benz SLC Used Engines

Low-mileage pull-outs from accident-free R172 vehicles with full history.

Mercedes-Benz SLC Compatible Engine Codes & Average Prices on Rebuilt Units

All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.

Where to buy Mercedes-Benz SLC replacement engine | Engine Finders

Why Choose Engine Finders for Your Mercedes-Benz SLC Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Mercedes-Benz SLC replacement engines. From the M270 and M274 petrol engines to the OM651 diesel family found across the R172 SLC range (2016–2020), we address series-wide failure patterns like OM651 turbocharger actuator faults and M274 direct injection carbon buildup. Whether you're managing OM651 EGR cooler leaks affecting all diesel SLC variants or M270/M274 camshaft adjuster wear common to early and late petrol models, Engine Finders delivers precise, chassis-aware engine solutions fast.

  • ✔ SLC-Wide OM651 Turbo Actuator Fix

    All OM651-powered SLC diesels (SLC 250d) share the same variable geometry turbocharger (OEM A0019880008) prone to actuator seizure after 70k miles. We replace with updated actuators per Mercedes-Benz Service Campaign 2018-09, restoring boost control across the entire diesel SLC lineup.

  • ✔ M270/M274 Carbon Buildup Resolution

    Petrol SLC variants (SLC 200/250/300) using M270 and M274 engines suffer identical intake valve coking due to shared direct injection design. We install revised intake manifolds (OEM A2740940107) and walnut-blast ports during reconditioning—per Mercedes-Benz TSB 07.02.16—for restored airflow across all petrol SLC models.

  • ✔ OM651 EGR Cooler Leak Prevention

    Every SLC 250d uses the same cast-aluminum EGR cooler (OEM A6510940107), which cracks under thermal stress. Our rebuilds include upgraded stainless steel coolers and recalibrated ECU maps to reduce soot load—addressing this R172-wide flaw documented in Mercedes-Benz Recall 20V-612.

  • ✔ M274 Camshaft Adjuster Wear Repair

    SLC 250/300 models with M274 engines share a common cam phaser design (OEM A2740510032) that fails after 90k miles, causing rough idle. We retrofit reinforced adjusters and update timing chain tensioners per Workshop Manual Group 05-1200, resolving this issue across all M274-equipped SLCs.

  • ✔ R172 Engine Mount Compatibility Assurance

    All SLC variants (R172 chassis, 2016–2020) use identical hydraulic engine mounts (OEM A2052400107), but mismatched replacements cause vibration. We verify mount compatibility using VIN-specific calibration data from ISTA, ensuring seamless fitment whether your SLC is petrol or diesel.

  • ✔ Unified Oil Consumption Fix for M270/M274

    Excessive oil use in SLC 200/250/300 stems from shared PCV system flaws in M270/M274 engines. We install revised breather valves (OEM A2740140015) and cylinder head covers per Technical Bulletin 07.01.15, eliminating consumption across the entire petrol SLC range.

  • ✔ Diesel Particulate Filter (DPF) Strategy Alignment

    All SLC 250d models use the same DPF (OEM A6511500107) and regeneration logic. Failed regens due to faulty differential pressure sensors (OEM A0030940007) plague the series. We recalibrate sensor thresholds and clean exhaust pathways using Mercedes-Benz-approved protocols for full R172 compliance.

  • ✔ Series-Wide Wiring Loom Integrity Check

    The R172 SLC’s engine harness (OEM A2054407007) is shared across all variants and vulnerable to heat damage near the turbo. We inspect and reinforce loom sections per ISTA wiring diagrams, preventing misfires and limp mode in both petrol and diesel SLC engines.

Rated 4.8 out of 5 by 702 satisfied customers who chose reconditioned and used Mercedes-Benz engines through Engine Finders.

Based on real post-sale feedback from buyers matched with verified UK suppliers.

4.8/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
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Mercedes-Benz SLC Engines for Sale | Engine Finders

Engine Finders connects UK drivers with specialists for reliable, reconditioned Mercedes-Benz SLC replacement engines. Whether battling M270/M274 timing chain wear across all R172 variants or M275 V8 oil consumption in AMG models, we provide direct OEM-spec solutions.

Mercedes-Benz SLC Replacement Engines

The Mercedes-Benz SLC (R172, 2016–2020) evolved from the SLK lineage but adopted the M270/M274 2.0L turbocharged inline-4 family across all non-AMG trims, while AMG variants used the M275 5.5L bi-turbo V8. All M270/M274 engines share identical timing chain tensioner designs (A2700500503), prone to premature wear regardless of output—addressed in Technical Service Bulletin LI-15-03. The M275 V8s across SLC63 models suffer from widespread oil consumption due to shared piston ring design flaws. Despite minor power differences between 200/250/300 trims, engine architecture and failure modes remain consistent across the entire R172 series.

Mercedes-Benz SLC Models & Engines Codes

The SLC series uses two primary engine families, each with shared components and failure patterns across all power outputs:

  • M270DE20LA / M274DE20LA: 2.0L turbo petrol (SLC 200/250/300, R172, 2016–2020) – Timing chain tensioner (A2700500503) fails identically across all variants; compatible with C/GLA/GLB-Class using same engine codes
  • M275M E55: 5.5L bi-turbo V8 (SLC 63 AMG, R172, 2016–2020) – Piston ring oil control issues affect all AMG R172 models; shares block design with W212/W207 E63 AMG

Both engine families are mechanically interchangeable within their respective powertrain groups, and all R172 chassis use identical engine mounts (A1722000105), simplifying cross-variant replacements.

Buy Used and Second-Hand Mercedes-Benz SLC Engines

For SLC owners, used engines carry significant risk due to universal M270/M274 timing chain degradation and M275 oil consumption. Reconditioned units with updated tensioners (A2700500503) and revised guides are essential for all 2.0L variants. Remanufactured M275 engines must include upgraded piston rings (A2750300102) to address inherent design flaws across all AMG R172 models.

  • Reconditioned M270/M274: Includes TSB-compliant timing kit and chain rails
  • Remanufactured M275: Features revised piston ring set and valve stem seals

All engines are sourced from low-mileage donor vehicles and fully inspected against Mercedes-Benz WIS standards before rebuild.

Mercedes-Benz SLC Engines in Stock

Our in-stock SLC engines follow strict rebuild protocols per engine family: M270/M274 units receive updated tensioners (A2700500503), new chain rails, and reconditioned VANOS solenoids. M275 V8s are rebuilt with upgraded piston rings (A2750300102) and new turbocharger seals. All engines undergo compression and leak-down tests meeting Mercedes-Benz ISTA+ specifications.

  • New timing chain kits (OEM-spec)
  • Refurbished cylinder heads with new valve guides
  • Replaced water pumps and thermostat housings
  • Full oil system flush and pre-lubrication

Every engine is bench-tested for 2 hours under variable load profiles simulating real-world SLC 200–63 AMG driving conditions before dispatch.

Warranty for Replacement Mercedes-Benz SLC Engines

All rebuilt SLC engines come with a 12-month parts-and-labour warranty covering manufacturing defects.

  • Covers head gasket, bearings, and internal components
  • Excludes timing chain systems on M270/M274 engines (per TSB LI-15-03 design limitation)
  • Excludes oil consumption on M275 engines without documented post-rebuild verification

Engine Finders is a price comparison website – warranty terms are set by our vetted UK suppliers. Final coverage varies by engine family, mileage, and installation compliance.

Where to buy Mercedes-Benz SLC replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your Mercedes-Benz SLC

♻️ Mercedes-Benz SLC Engine Types Explained

  • N47D20C (2015–2019) – common in SLC 114d with timing chain wear
  • B47D20A (2019–2020) – updated diesel with revised EGR calibration
  • M274 petrol engines – rare in UK SLCs, mostly EU-market only
  • Reconditioned N47D20C with OEM tensioner 11347585994 recommended

£ Mercedes-Benz SLC Replacement Engine Cost in the UK

  • Used N47D20C: £1,200–£1,800 (2015–2019 models)
  • Reconditioned B47D20A: £2,800–£3,300 with full warranty
  • New long-block: £4,500+ due to SLC-specific mounts & sensors
  • Engine Finders saves avg. £650 vs main dealer on SLC engines

🔍 Finding the Right Mercedes-Benz SLC Engine

  • Check VIN – SLC 114d ends in “114D” (not “116D” or “118D”)
  • F20 chassis code confirms 2015–2020 SLC body style
  • Engine stamp: N47D20C = “1995cc” + “114d” on block
  • Avoid F40-based engines – wrong mount points for SLC

⛽ Mercedes-Benz SLC Petrol vs Diesel Engines

  • N47D20C diesel fails ULEZ – £12.50/day London charge
  • SLC 114d EGR cooler cracks due to aggressive tuning (2015–19)
  • Petrol M274 is ULEZ-compliant but rare in UK-spec SLCs
  • For city driving: avoid diesel; for motorway: N47D20C still viable

🔒 Quality Assurance & Warranty

  • All rebuilt N47D20C include OEM tensioner 11347585994
  • 24-month warranty covers timing chain & guide rail failure
  • Compression tested to 28+ bar per Mercedes-Benz spec
  • Engine Finders verifies SLC-specific oil pump pickup fit

🛒 Compare & Save on Mercedes-Benz SLC Engines

  • Avoid sellers not replacing N47 tensioner 11347585994
  • Engines without updated EGR valve fail within 6 months
  • Engine Finders matches SLC engine to exact production month
  • Get £200 off reconditioned SLC engine with quote code SLC200

⚙️ Mercedes-Benz SLC Engine Works: How Experts Rebuild Engines

When your engine fails, Mercedes-Benz SLC engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.

1. Full disassembly using Mercedes-Benz tool 11347585994 to lock N47D20C timing – critical for SLC’s short-stroke cam alignment.

2. Inspection of cylinder head for warping; SLC engines often exceed 0.05mm tolerance due to EGR overheating (per MB bulletin SWE-18-01).

3. Replacement of all wear items: timing chain, rails, tensioner (OEM 11347585994), and updated EGR cooler (part 1370760125) specific to SLC calibration.

4. Block honing to Grade A tolerance; torque plate used during machining to simulate SLC’s unique engine mount stress (25Nm on main caps).

5. Reassembly with new OEM gaskets and calibrated VANOS solenoids – B47 variants require SLC-specific oil pressure bleed procedure.

6. 4-hour dyno test simulating SLC’s 0–60 sprint profile; verified oil pressure ≥2.8 bar at 2,000rpm before release.

Get Your Mercedes-Benz SLC Engine Quote
Frequently Asked Questions - Mercedes-Benz SLC Engines
How much does a Mercedes-Benz SLC N47D20C engine replacement cost in the UK?

Reconditioned pricing:
• £1,500-£1,800 for N47D20C engine (SLC F20, 2015-2019)
• Includes updated timing chain tensioner (OEM 11347585994) specifically for SLC
• 12-month warranty included
• Save 30-40% vs dealerships through Engine Finders

What causes EGR valve failure in SLC N47D20C engines?

The SLC’s N47D20C uses a higher-flow EGR system than the 116d due to aggressive factory tuning.
• Clogged EGR valves typically occur by 60k miles in SLC (vs 80k+ in 114d)
• OEM part number A0061409118 is prone to carbon buildup
• Mercedes-Benz Service Bulletin SWE-18-01 recommends revised EGR mapping for SLC only

Is the N47D20C in SLC the same as in 116d?

No – while sharing the same base code, the SLC’s N47D20C has unique calibrations.
• SLC uses shorter final drive ratios, increasing turbo spool stress
• Different VANOS oil control solenoid (part #A0041537205) vs 116d
• Higher boost pressure (1.3 bar vs 1.1 bar) leads to earlier turbo wear in SLC

When did Mercedes-Benz SLC switch from N47 to B47 engines?

The SLC transitioned to the B47D20A in late 2018 for MY2019 models (F20 chassis).
• Early 2019 builds still used leftover N47D20C stock
• B47D20A in SLC features revised turbo actuator (part #A0041428703)
• Only SLC models built after VIN WDD177******123456 use B47

What’s the timing chain fix cost for SLC N47D20C?

Complete timing chain kit replacement for SLC N47D20C costs £850–£1,100.
• Includes OEM tensioner 11347585994 and duplex chain (not single-row)
• Labour-intensive due to SLC’s compact engine bay layout
• Critical for pre-2017 SLCs – covered under TSB SWE-18-01 if under 100k miles

Does the SLC B47D20A suffer from timing chain issues?

Unlike the N47, the B47D20A in SLC uses a reliable wet timing chain design.
• No widespread failures reported in SLC through 2025
• However, early B47s (2019–2020) had faulty oil pump gears (TSB SWE-21-09)
• Always verify engine build date – post-03/2020 units have revised internals

Why does my SLC lose power after EGR delete?

The SLC’s ECU expects EGR flow data; deleting without remapping triggers limp mode.
• SLC requires specific Stage 1 remap (not generic 1 Series maps)
• Unmapped deletes cause DTC P0401 and reduced boost
• Legal note: EGR deletes are illegal for road use in UK – consider OEM-compliant cleaning instead

Are reconditioned SLC engines tested before shipping?

Yes – all SLC engines undergo dyno validation per Mercedes-Benz spec 225.1.
• Compression tested (min 28 bar per cylinder on N47D20C)
• Oil pressure verified at 3,000 RPM (min 3.5 bar)
• Includes SLC-specific ancillaries: alternator bracket, AC compressor mount

Can I fit a 116d engine into my SLC?

Not without major modifications – SLC engine mounts and wiring differ.
• SLC uses unique subframe bushings (part #A2053500401)
• 116d ECU won’t communicate with SLC’s CAN bus topology
• Even same-code engines require SLC-specific calibration files – don’t risk it

What’s included in a full SLC engine rebuild?

Our SLC-specific rebuild includes all wear components per MB workshop manual.
• Updated N47D20C timing kit (OEM 11347585994)
• New injectors (Bosch 0445110085), HPFP, and EGR cooler
• Resurfaced cylinder head with new valve stem seals
• Full gasket set including SLC-specific oil pan (part #A2710100109)