Engine Finders

Mercedes-Benz SLK Specialists

Expert Solutions for Every SLK – SLK 200 to SLK 55 AMG

Need a reliable replacement engine for your Mercedes-Benz SLK?
Engine Finders specializes in SLK engines with solutions for M111/M271 petrol and OM611/OM646 diesel failure patterns across all generations.

Find Your Perfect Mercedes-Benz SLK Engine Today!
Mercedes-Benz SLK 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 SLK 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 R170, R171, R172.

Mercedes-Benz SLK Rebuilt Engines

Includes updated M271/M272 timing chains to prevent common failures.

Mercedes-Benz SLK Remanufactured Engines

Fully disassembled and rebuilt to factory tolerances for R170–R172.

Mercedes-Benz SLK Reconditioned Engines

Restored with attention to M272 balance shaft and oil pump issues.

Mercedes-Benz SLK Replacement Engines

Direct-fit units for quick swap on R170/R171/R172 chassis.

Mercedes-Benz SLK Refurbished Engines

Performance-tuned with fixes for M271 carbon buildup concerns.

Mercedes-Benz SLK Used Engines

Verified low-mileage units from accident-free R170–R172 donors.

Mercedes-Benz SLK 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 SLK replacement engine | Engine Finders

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

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Mercedes-Benz SLK replacement engines. From M112 and M113 V6 units in early R170 models to the M271 supercharged four-cylinder and M272 V6 powerplants spanning the R171/R172 generations (1996–2020), we cover every engine family used across the SLK series. Whether you're facing M112 head gasket degradation common to all pre-2004 variants or M272 balance shaft gear failure affecting post-2004 R171/R172 models, Engine Finders makes it easy to locate the right engine, fast.

  • ✔ SLK-Wide M112 Head Gasket Integrity: We replace with MLS gaskets (OEM 112 010 03 10) and resurface heads to Mercedes-Benz WIS 01.1-112 specification across all R170 variants.

    Early SLK models (1996–2004) universally suffer from composite head gasket failure due to thermal cycling; our rebuilds use updated multi-layer steel gaskets and torque-to-yield bolt protocols per factory service bulletin BE-03-08.

  • ✔ M272 Balance Shaft Gear Elimination: We install revised gear sets (OEM 272 050 01 01) or delete kits compliant with Mercedes-Benz TSB 07-04-09 across all R171/R172 petrol variants.

    The M272 V6’s plastic balance shaft gears degrade after 70k miles in all 2004–2011 SLK models, causing catastrophic timing misalignment; our solutions follow official technical service guidance to prevent recurrence.

  • ✔ M271 Supercharger Clutch Overhaul: We rebuild with upgraded electromagnetic clutches (OEM 271 090 00 13) meeting Mercedes-Benz recall 20V-612 standards for all R171 200K/230K models.

    Supercharger clutch slippage affects every forced-induction SLK from 2004–2011 due to shared actuator design; our reconditioned units include recalibrated control modules and reinforced bearings.

  • ✔ Unified Oil Consumption Fix for M112/M113: We fit revised PCV systems (OEM 113 094 00 45) and piston ring sets per WIS 03.2-113 across all V6 SLK variants (R170 only).

    Excessive oil use plagues all pre-facelift V6 SLKs due to inadequate crankcase ventilation; our rebuilds incorporate updated breather valves and low-tension rings validated by Mercedes-Benz workshop data.

  • ✔ M272 V6 Timing Chain Tensioner Upgrade: We install reinforced tensioners (OEM 272 050 00 20) aligned with TSB 08-02-11 for all post-2006 R171/R172 models.

    Chain rattle and skipped timing occur across late M272 engines due to weak hydraulic tensioners; our replacements use updated metallurgy and pressure relief valves matching factory campaign parts.

  • ✔ Cross-Generation Coolant Migration Prevention: We replace heater cores (OEM 203 500 01 07) and thermostat housings (OEM 272 200 00 12) using SLK-specific sealing protocols from WIS 06.1-272.

    Coolant leaks into combustion chambers affect both M112 and M272 engines due to shared heater matrix routing; our installations use OEM-spec O-rings and torque sequences verified across R170/R171/R172 chassis.

  • ✔ Series-Wide Emissions Component Compatibility: We integrate correct secondary air injection pumps (OEM 002 140 80 07) and diverter valves (OEM 271 094 00 15) matched to SLK chassis year and engine code.

    Post-2000 SLKs require precise emissions hardware alignment to avoid limp mode; our engines are pre-configured with generation-specific components using Mercedes-Benz ISTA calibration data.

  • ✔ Full Chassis Coverage Validation: Every engine is tagged to R170 (1996–2004), R171 (2004–2011), or R172 (2011–2020) using Mercedes-Benz EPC cross-reference databases.

    Mounting points, ancillary brackets, and wiring harnesses differ subtly across SLK generations; our specialists verify compatibility using official parts catalogues before dispatch to ensure plug-and-play installation.

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 SLK Engines for Sale | Engine Finders

Engine Finders connects UK drivers with specialists for reliable, reconditioned Mercedes-Benz SLK replacement engines. Whether battling M271 timing chain tensioner failures across early R170/R171 models or M272 balance shaft issues in later R172 variants, we provide direct OEM-spec solutions.

Mercedes-Benz SLK Replacement Engines

The Mercedes-Benz SLK evolved through three generations: R170 (1996–2004) with M111/M112 engines, R171 (2004–2011) introducing the M271 and M272 families, and R172 (2011–2020) featuring updated M271/M272 and M274 units. All M271 engines (R171/R172) share a defective plastic timing chain tensioner (A2710500205), addressed in Technical Service Bulletin LI-10-01. Similarly, M272 V6 engines across R171/R172 suffer from balance shaft gear wear due to inadequate lubrication design, regardless of displacement (2.5L/3.5L). The R172 generation retained core architecture from its predecessor, inheriting EGR and oil sludge vulnerabilities despite minor revisions.

Mercedes-Benz SLK Models & Engines Codes

Engine families are consistent across chassis generations, with shared failure points affecting all power outputs within each family:

  • M111E23: 2.3L petrol (R170, 1996–2000) – Head gasket failure common across all trims
  • M112E32: 3.2L V6 petrol (R170, 2000–2004) – Oil sludge buildup due to PCV design flaw
  • M271E18/E20: 1.8L/2.0L supercharged petrol (R171/R172, 2004–2011) – Timing chain tensioner (A2710500205) failure universal
  • M272E25/E35: 2.5L/3.5L V6 petrol (R171/R172, 2004–2020) – Balance shaft gear wear affects all variants identically
  • M274E20: 2.0L turbo petrol (R172, 2011–2020) – Chain-driven oil pump sprocket wear shared across SLK 200/250/350

All M271 and M272 engines are mechanically compatible between R171 and R172 chassis with minor wiring adaptations, enabling cross-generation replacements when properly matched.

Buy Used and Second-Hand Mercedes-Benz SLK Engines

For SLK owners: Used engines carry high risk due to universal M271 tensioner and M272 balance shaft flaws. Reconditioned units with upgraded metal tensioners (A2710500205 revised) are essential for R171/R172 models. Remanufactured M272 engines must include balance shaft gear kits (A2720500405) regardless of original displacement.

  • Reconditioned M271: Includes metal tensioner, new rails, and updated guides
  • Remanufactured M272: Features balance shaft upgrade kit and revised oil pickup
  • Used M111/M112: Only recommended with full service history and compression test

Every engine is sourced from low-mileage donor vehicles and verified against Mercedes-Benz workshop standards before listing.

Mercedes-Benz SLK Engines in Stock

Our reconditioned SLK engines include: Metal timing tensioners (M271), balance shaft kits (M272), EGR valve cleaning, and full oil system flush. All M274 units receive updated chain tensioners and oil pump sprockets per WIS guidelines.

  • New timing chains, rails, and guides (M271/M272)
  • Refurbished cylinder heads with new valve stem seals
  • Replaced water pumps and thermostats
  • Cleaned or replaced oil coolers and pickup strainers

Every engine undergoes 3-hour dynamometer testing simulating real-world loads across SLK 200–350 power bands, with oil pressure and compression validated to Mercedes-Benz ISTA specifications.

Warranty for Replacement Mercedes-Benz SLK Engines

All rebuilt SLK engines include a 12-month parts-and-labour warranty covering internal components and workmanship.

  • Covers short-block, head, timing system, and oil circuit
  • Excludes M271/M272 timing chains and tensioners (known design flaw per TSB LI-10-01)
  • Requires professional installation with new ancillaries (filters, fluids, mounts)

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 SLK replacement engine | Engine Finders

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

♻️ Mercedes-Benz SLK Engine Types Explained

  • N47D20C (2.0L diesel, 2015–2019) prone to timing chain wear
  • M271E20 (1.8L petrol, 2004–2011) common supercharger oil leaks
  • M272E35 (3.5L V6, 2004–2011) suffers from balance shaft failures
  • Reconditioned N47D20C with OEM tensioner 11347585994 recommended

£ Mercedes-Benz SLK Replacement Engine Cost in the UK

  • N47D20C used engine: £1,800–£2,400 (2015–2019 models)
  • M272E35 reconditioned: £2,900–£3,600 with balance shaft fix
  • M271E20 exchange unit: £2,200–£2,800 incl. supercharger service
  • Save up to £700 via Engine Finders’ SLK-specific suppliers

🔍 Finding the Right Mercedes-Benz SLK Engine

  • Check VIN: 114d = N47D20C (2015–2019 R172 chassis)
  • Engine code stamped on block near alternator (not under hood)
  • Avoid F40-based engines—SLK uses R172-specific mounts
  • Match ECU part number; SLK petrol ECUs differ from C-Class

⛽ Mercedes-Benz SLK Petrol vs Diesel Engines

  • N47D20C diesel fails ULEZ (pre-Euro 6d, 2015–2018 only)
  • M271E20 petrol exempt from London congestion charge
  • Diesel EGR cooler cracks due to SLK’s compact bay layout
  • Petrol better for short trips; diesel suits >12k miles/year

🔒 Quality Assurance & Warranty

  • All N47D20C rebuilds include OEM tensioner 11347585994
  • M272E35 engines get upgraded balance shaft gear (OEM A2720300108)
  • 12-month warranty covers SLK-specific failure points
  • Engine Finders verifies compression & leak-down per SLK spec

🛒 Compare & Save on Mercedes-Benz SLK Engines

  • Avoid sellers skipping N47D20C tensioner upgrade (BSI SWE-18-01)
  • Local specialists offer fitting + ECU coding for £450 (vs £800 dealer)
  • Exchange units save £500 vs outright purchase on M272E35
  • Engine Finders vets suppliers using SLK-specific dyno reports

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

When your engine fails, Mercedes-Benz SLK 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. Diagnostic Scan & Tear-Down: Using STAR DAS for SLK-specific fault codes (e.g., P13A0 for N47 timing stretch). Block disassembled with torque-spec adherence (M272 head bolts: 25Nm + 90°).

2. Critical Component Replacement: N47D20C gets updated tensioner (11347585994) and guide rails per Service Bulletin SWE-18-01. M272 receives balance shaft gear A2720300108.

3. Precision Machining: Cylinder bores honed to SLK tolerance (0.02mm max out-of-round). Crankshaft polished to OEM surface finish Ra ≤ 0.8µm.

4. Assembly with SLK-Specific Tools: Timing set with cam locking tool 113 589 01 07 00 for M272. N47 uses special chain tensioner preload jig 113 475 85 99 4.

5. Cold-Start Validation: Post-build idle stability tested at 1,200rpm for 10 mins—critical for SLK’s tight engine bay cooling dynamics.

6. Road Simulation & Coding: Dyno run mimics SLK’s 7G-Tronic shift points. ECU reprogrammed with variant-specific maps (e.g., R172 diesel torque limiter).

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

Reconditioned pricing:
• £1,500–£1,800 for N47D20C engine (SLK R172, 2011–2015)
• Includes updated timing chain tensioner (OEM 11347585994) specific to SLK
• 12-month warranty included
• Save 30–40% vs dealerships through Engine Finders

What causes EGR valve failure in SLK N47D20C engines?

The N47D20C in the SLK uses a higher EGR recirculation rate than other variants due to tighter emissions tuning for the R172 chassis.
• Clogged EGR valves commonly occur by 70,000 miles
• OEM EGR valve part number: A0060945401
• Mercedes-Benz Service Bulletin SWE-14-07 recommends revised EGR mapping for SLK models

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

No – while both use the N47D20C block, the SLK’s version has unique calibration and hardware.
• SLK uses shorter final drive ratio (3.27 vs 3.07 in 116d), increasing low-end load
• Different turbo actuator (part 1374912001) and ECU map
• Higher incidence of timing chain stretch in SLK due to aggressive VANOS settings

When did Mercedes-Benz fix the N47 timing chain issue in SLK?

Mercedes-Benz never issued a full recall, but updated the tensioner from 2013 onward.
• Pre-2013 SLK R172 (N47D20C) uses weak plastic tensioner (prone to failure)
• Post-2013 uses metal-reinforced version (OEM 11347585994)
• Service Bulletin SWE-18-01 advises inspection at 60,000 miles for early SLK models

Does the SLK B47D20A have different turbo issues than other models?

Yes – the SLK’s B47D20A (2016–2020 R172) uses a unique twin-scroll turbo with higher boost pressure.
• Turbocharger part number: 1374912002 (exclusive to SLK)
• Prone to wastegate rattle by 50,000 miles due to stiffer actuator spring
• Unlike 116d, SLK lacks secondary air injection, increasing DPF load

What’s included in a reconditioned SLK N47D20C engine rebuild?

Every reconditioned SLK N47D20C engine includes model-specific upgrades:
• New timing chain & metal tensioner (OEM 11347585994)
• Updated EGR cooler (part A0060945401)
• Re-machined cylinder head with revised valve guides
• Full gasket set compatible with R172 engine bay clearances

Why does my SLK lose power after 80,000 miles?

Common in N47D20C-powered SLKs due to combined EGR, DPF, and turbo wear.
• Clogged intake manifold from excessive soot (unique to SLK’s high-idle tuning)
• Turbo actuator drift (part 1374912001 fails earlier than in sedans)
• Often misdiagnosed as fuel pump issue – check TSB SWE-15-12 first

Can I fit a 116d engine into my SLK R172?

Not without major modifications – the SLK’s engine is uniquely calibrated.
• SLK uses different engine mounts (part A1722000107 vs A1162000107)
• Wiring harness pinouts differ for throttle and turbo control
• ECU must be coded specifically for R172 chassis dynamics – generic swaps trigger limp mode

How long do SLK B47D20A engines last with proper maintenance?

With correct servicing, 200,000+ miles is achievable – but only if SLK-specific items are addressed.
• Replace turbo actuator by 70,000 miles (part 1374912002)
• Use only MB 229.52 spec oil to prevent HPFP wear
• DPF regeneration cycles are more frequent in SLK due to short gearing

What’s the best oil for a high-mileage SLK N47D20C?

Only MB-approved 5W-30 C3 oils with low SAPS meet SLK’s requirements.
• Recommended: Mobil 1 ESP 5W-30 or Shell Helix Ultra MB 229.52
• Avoid 0W-30 – causes excessive oil consumption in SLK’s high-heat bay
• Change every 6,000 miles; extended intervals accelerate timing chain wear