How much does a Mercedes-AMG SLC43 engine replacement cost in the UK?

A reconditioned SLC43 engine (M276.822) typically costs £3,312–£4,500 supply only depending on power output (367 PS or 390 PS). A replacement M276.822 engine costs on average £3,312 in good condition. Labour costs for engine replacement typically range from £800 to £2,500. On average, a full engine replacement can run anywhere between £1,500 and £5,000. Fitting adds £1,200–£1,800. Use our calculator for a figure specific to your vehicle.

What are the common problems with the Mercedes-AMG SLC43?

The most common issues are oil leaks (turbo oil feed lines and camshaft adjuster solenoids), turbocharger wear (whining, wastegate rattle, loss of power), high‑pressure fuel pump failure (hard starting, rough running), and 9G‑Tronic transmission hesitation. The M276 engine is generally reliable when properly maintained.

Is it worth replacing an SLC43 engine, or should I scrap the car?

Depends on vehicle value and condition. Against a tidy £15,000–£30,000 SLC43, a £3,312–£4,500 recon is 10‑30% of the car's value – often worth it on well‑maintained examples. If the engine has suffered catastrophic turbo failure or timing chain failure, a full engine replacement may be necessary. Get a full diagnostic assessment before committing. The SLC43 is a rare and collectable car, so well‑preserved examples may justify the investment.

How do I find my SLC43's engine code?

The SLC43 AMG uses the M276.822 engine code – a 3.0‑litre V6 bi‑turbo. The engine code is stamped on the engine block and listed on your V5C. The 367 PS variant was produced from 2016‑2018; the 390 PS variant was produced from 2018‑2020.

Can I repair an SLC43 engine issue, or does it need replacement?

Most issues – oil leaks, turbocharger wear (if caught early), HPFP failure, transmission hesitation – are repairable. However, if the turbocharger has failed catastrophically and sent metal fragments into the engine, a full engine replacement is usually more cost‑effective than a rebuild. The M276 is a complex, high‑performance engine requiring specialist knowledge.

Mercedes-AMG SLC432016–20203.0L V6 Bi‑Turbo (M276.822)

Mercedes-AMG SLC43 Engine Replacement — Compare Prices & Get Quotes

Name: Mercedes-AMG SLC43 UK Engine Enquiry Data 2025
Creator: MercedesEngine.uk

Get quotes today from trusted UK Mercedes specialists. Compare reconditioned, rebuilt and used M276 3.0‑litre V6 bi‑turbo engines for the SLC43 AMG — the handcrafted, twin‑turbo V6 that powered Mercedes' final AMG two‑seat roadster. Supply & fit available nationwide.

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Mercedes-AMG SLC43 Engines — from £1,800 to £4,500Engine code: M276.822

Mercedes-AMG SLC43 Engines — from £1,800 to £4,500· Engine code: M276.822

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Mercedes-AMG SLC43 — Which Engine Does Your Car Actually Have?

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

Era Note

367 PS, 520 Nm — handcrafted AMG V6, generally reliable but oil leaks and turbo wear are known concerns

GenerationYearsEngine CodeReliabilityRecon CostEra Note

R172 (Pre‑facelift) BMW 320d R172 (Pre‑facelift)

2016–2018M276.822 (3.0L V6 Bi‑Turbo)★★★½☆ [NEWLY ASSIGNED — see Data Note]£3,312–£3,800 [PLACEHOLDER — confirm vs cost sheet]367 PS, 520 Nm — handcrafted AMG V6, generally reliable but oil leaks and turbo wear are known concerns

R172 (Facelift / Final Edition) BMW 320d R172 (Facelift / Final Edition)

2018–2020M276.822 (3.0L V6 Bi‑Turbo)★★★½☆ [NEWLY ASSIGNED — see Data Note]£3,400–£4,500 [PLACEHOLDER — confirm vs cost sheet]390 PS, 520 Nm — higher‑output tune, same M276 architecture, 9G‑Tronic transmission

Why use this era map?

This table is the single source every other section on this page must match. Sections 2, 4, and 6 reference it rather than restating conflicting figures.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes-AMG SLC43 Engine Replacement Costs

Supply Only£3,312–£3,800

Fitted (Indie)£4,300–£5,200

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,800–£3,312£2,800–£4,5001–6 monthsBudget priority; short‑term ownership

Reconditioned Engine£3,312–£3,800£4,300–£5,20012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£3,800–£4,500£4,800–£6,00012–24 monthsLong‑term ownership; maximum reliability

Main Dealer New£5,500–£7,500£7,000–£9,50024–36 monthsInsurance jobs; warranty claims; full provenance

Figures above reflect the SLC43 AMG pricing. A replacement M276.822 engine costs on average £3,312 in good condition, with new or reconditioned units costing up to £3,450. Labour costs for engine replacement typically range from £800 to £2,500. On average, a full engine replacement can run anywhere between £1,500 and £5,000 depending on the car model and engine type. As a handcrafted AMG engine, costs are at the upper end of the range. A full engine replacement with labour can cost £9,000–£13,000.

Labour estimate: Fitting an SLC43 engine typically takes 12‑16 hours at £75‑£110/hr (independent Mercedes specialist). The SLC's compact roadster engine bay and the twin‑turbo V6 layout add significant labour complexity.

→ Compare SLC43 AMG engine prices from UK specialists

Common Problems

1. M276 Oil Leaks — Turbocharger Oil Feed Lines & Camshaft Adjuster Solenoids

Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning, visible oil leak from the engine bay. Oil leaks are a prevalent issue on the M276 engine. Both the turbocharger oil feed lines and the camshaft adjuster solenoids are known leak points.

Typical mileage: 40,000–80,000 miles.

Repair cost: £300–£1,200 [PLACEHOLDER] (oil feed line or solenoid seal replacement).

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

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

Oil leaks are one of the most frequent complaints with the M276 engine. The turbocharger oil feed lines can develop leaks, and the camshaft adjuster solenoids can weep oil, which can then migrate through the wiring harness and cause sensor and control unit issues. If you notice oil spots or a burning smell, have the engine inspected immediately. Ignoring oil leaks can lead to accelerated engine wear, turbo failure, and in worst cases, bearing damage or engine seizure.

1. M276 Oil Leaks — Turbocharger Oil Feed Lines & Camshaft Adjuster Solenoids

Typical mileage: 40,000–80,000 miles.

Repair cost: £300–£1,200 [PLACEHOLDER] (oil feed line or solenoid seal replacement).

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

🟠 Check - book inspection urgently if oil leak is detected.

Our recommendation:

2. Turbocharger Wear — Whining, Wastegate Rattle & Boost Issues

Symptoms: Whining or siren‑like noise from the engine bay that changes with RPM, rattling noise (wastegate rattle), loss of power, sluggish acceleration, excessive exhaust smoke (blue or grey), Check Engine Light with underboost codes (P0299).

Typical mileage: 40,000–80,000 miles.

Repair cost: £800–£2,500 [PLACEHOLDER] (turbocharger replacement — left and right turbos are different and not interchangeable).

Replacement cost: N/A — repair only (if caught early; ignored turbo failure can send metal fragments into the engine).

🟠 Check - book inspection urgently if you notice whining, power loss, or rattling.

Our recommendation:

The M276 engine uses two turbochargers — one for each cylinder bank. Oil starvation and contamination are the leading causes of failure. A wastegate rattle is a common issue, but excessive play can lead to boost leaks and requires replacement. If you notice a whining or rattling noise, loss of power, or smoke, have the turbo system inspected immediately. When replacing a turbo, always replace the oil feed lines and change the oil.

3. High‑Pressure Fuel Pump (HPFP) & Fuel System Issues

Symptoms: Long cranking on start (hot or cold), loss of power, engine stalling, engine warning light, rough idle, misfires. Fuel system issues are a common cause of stalling on the SLC43 AMG.

Typical mileage: 30,000–60,000 miles.

Repair cost: £600–£1,500 [PLACEHOLDER] (HPFP or injector replacement).

Replacement cost: N/A — repair only (if caught early; ignored HPFP failure can damage catalytic converters).

🟠 Check - book inspection urgently if hard starting or rough running occurs.

Our recommendation:

The M276's direct injection system places high demands on the fuel system. A clogged fuel filter or failing fuel pump can restrict fuel flow, resulting in poor engine performance and starting issues. Injector driver faults and ECU issues have also been reported. If you experience hard starting or rough running, have the fuel system inspected immediately. Regular fuel filter changes and using high‑quality fuel can help prevent issues.

4. 9G‑Tronic Transmission Hesitation & Shift Quality Issues

Symptoms: Hesitation when pulling away, jerky gear changes, transmission getting confused, delayed downshifts. The 9G‑Tronic has been described as "wonky" by some owners.

Typical mileage: 10,000–40,000 miles.

Repair cost: £500–£2,500 [PLACEHOLDER] (software update, valve body repair, or transmission overhaul).

Replacement cost: N/A — repair only.

🟡 Monitor - book inspection soon if symptoms develop. If the transmission hesitates dangerously when pulling into traffic, book an urgent inspection.

Our recommendation:

The AMG‑tuned 9G‑Tronic transmission in the SLC43 can suffer from hesitation and jerky shifts. A software update (TCU reprogramming) may resolve the issue. In more severe cases, valve body repair or clutch replacement may be required. If you experience hesitation when pulling away, have the transmission control module software checked.

5. M276 Camshaft Adjuster Solenoid & Timing Chain Wear

Symptoms: Rattling or ticking noise on cold start, rough idle, engine warning light. Camshaft adjuster solenoids can wear, and timing chain stretch is a potential issue on neglected oil intervals.

Typical mileage: 50,000–80,000 miles.

Repair cost: £400–£1,200 [PLACEHOLDER] (camshaft adjuster solenoid replacement).

Replacement cost: £1,500–£3,500 [PLACEHOLDER] (if timing chain issues develop).

🟠 Check - book inspection urgently if you hear unusual noises on cold start.

Our recommendation:

The M276's camshaft adjuster solenoids can wear, causing ticking or rattling noises on cold start. Regular oil changes (using the correct MB‑spec oil) are essential to prevent premature wear. If you hear unusual noises on start‑up, have the camshaft adjusters inspected. A preventative solenoid replacement is far cheaper than addressing timing chain issues later.

Weighing Your Options?

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25+ vetted Mercedes specialists, covering the M276 V6 bi‑turbo engine of the SLC43 AMG, with a 12‑month warranty as standard.

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Mercedes-AMG SLC43 — 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-AMG SLC43 — 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 oil leaks (turbo lines / solenoids)✅ Yes£300–£1,200 [PLACEHOLDER]Essential maintenance — always worth doingTurbocharger wear✅ Yes£800–£2,500 [PLACEHOLDER]Worth fixing — common on high‑stress turbo enginesHPFP / fuel injector issues✅ Yes£600–£1,500 [PLACEHOLDER]Worth fixing — common and well‑understood repair9G‑Tronic transmission issues✅ Yes£500–£2,500 [PLACEHOLDER]Software update may resolve; worth fixingCamshaft adjuster solenoid wear✅ Yes£400–£1,200 [PLACEHOLDER]Worth fixing — common on higher‑mileage enginesMajor internal failure (crank, bearings)❌ Usually No£3,312–£4,500+Full engine replacement often more cost‑effective

Buying This Mercedes-AMG SLC43? Check These First

Buy If

Full Mercedes service history with regular oil changes (every 8,000‑10,000 miles)
No oil leaks — turbo oil feed lines and camshaft adjuster solenoids should be dry
Turbo system in good health — no whining or rattling
Transmission shifts smoothly — no hesitation or jerky shifts
A well‑maintained example — the M276 is a durable engine when properly cared for

Avoid If

Any sign of oil leaks — turbo lines or solenoid seals
Any sign of turbo whining or rattling — turbocharger warning
Any sign of hard starting or rough running — HPFP or injector warning
Any sign of transmission hesitation or jerky shifts — 9G‑Tronic warning
Poor service history — the M276 is intolerant of neglect

Closing Verdict

The Mercedes-AMG SLC43 is a rare and characterful roadster — the final AMG‑powered two‑seat convertible before the SL‑Class re‑established the V8 lineage. The M276 3.0‑litre V6 bi‑turbo is a smooth, responsive engine that delivers 367‑390 PS and 520 Nm of torque. It is generally reliable, but like all high‑performance engines, it has known weaknesses: oil leaks from turbocharger oil feed lines and camshaft adjuster solenoids, turbocharger wear, HPFP issues, and 9G‑Tronic transmission hesitation. Buy on service history above all else — a well‑maintained SLC43 is a rewarding and increasingly collectable car; a neglected example can be expensive to repair.

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

→ Compare SLC43 AMG engine prices before you buy

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Buying Checklist

Before you buy a used Mercedes-AMG SLC43 (or before you commit to an engine replacement), check these:

1. Cold Start — Any rattling or ticking? (camshaft adjuster warning)

2. Service History — Regular oil changes (every 8,000‑10,000 miles) — this is non‑negotiable

3. Oil Leaks — Check under the vehicle and around the engine for any signs of leakage

4. Turbo Health — Any whining, rattling, or loss of power? (turbocharger warning)

5. Hard Starting — Any long cranking on hot or cold start? (HPFP warning)

6. Transmission — Any hesitation, jerky shifts, or clunking? (9G‑Tronic warning)

7. Engine Warning Light — Have codes been read? Any turbo, fuel, or transmission codes?

8. MOT History — Check for emissions‑related failures or any advisory notes

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.

M276.822 (3.0L V6 Bi‑Turbo)

Years2016–2018

Power367 PS (270 kW) / 520 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£3,312–£3,800 [PLACEHOLDER]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

M276.822 (3.0L V6 Bi‑Turbo)2016–2018367 PS (270 kW) / 520 Nm— (pattern data)£3,312–£3,800 [PLACEHOLDER]

M276.822 (3.0L V6 Bi‑Turbo)2018–2020390 PS (287 kW) / 520 Nm— (pattern data)£3,400–£4,500 [PLACEHOLDER]

Technical Specs

M276.822 — 3.0L V6 Bi‑Turbo

Displacement2,996 cc

Cylinders6‑cylinder V6 (90°)

Bore x Stroke88.0 x 82.1 mm

Compression Ratio10.7:1

Block MaterialAluminium alloy with Nanoslide cylinder lining

Head MaterialAluminium alloy

ValvetrainDOHC, 4 valves per cylinder, chain‑driven

Fuel SystemDirect injection (piezo injectors, up to 200 bar)

AspirationBi‑Turbo (twin‑turbo)

Turbocharger Boost1.1 bar (15.95 psi) relative charge pressure

TransmissionAMG 9G‑Tronic 9‑speed automatic

DrivetrainRear‑wheel drive

0‑60 mph4.6 seconds

Top Speed155 mph (electronically limited)

→ Compare SLC43 AMG engine prices for your Mercedes

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Market Intelligence

Most Common Failure

Oil leaks (turbo lines / solenoid seals) — the most frequent M276 issue

Average Enquiry Mileage

30,000

–50,000 miles

[PATTERN DATA]

Average Replacement Cost

£3,312

reconditioned, supply only

[PLACEHOLDER]

Most Requested Engine Code

M276.822 — the sole SLC43 engine

[PATTERN DATA]

Peak Enquiry Season

Spring/Summer — convertible roadster interest peaks

[PATTERN DATA]

Regional Demand

South East22%

London18%

South West (12%) — premium roadster strongholds

PATTERN DATA

Regional Demand Breakdown

22%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-AMG SLC43 Owners Trust MercedesEngine.uk

Trusted SLC43 Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real SLC owners, as part of the Engine Finders network, covering the M276 3.0‑litre V6 bi‑turbo engine with specialist knowledge of AMG's handcrafted powertrains.
Compare SLC43 Engine Replacement Companies
see prices, warranty terms and supply & fit options side‑by‑side before you commit, with specialists who understand the M276's oil leak vulnerabilities, turbocharger requirements, and the importance of regular oil changes.
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supply‑only or full supply & fit available nationwide, covering the R172 SLC43 from 2016 to 2020, with specialist knowledge of Mercedes‑AMG's final two‑seat roadster engine.

Find the best Mercedes-AMG SLC43 engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back behind the wheel of your iconic roadster with confidence.

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