Engines Market
M275Petrol5.5L/6.0L V12 twin-turbo2002-2017

Mercedes M275 Engine - Replacement Cost, Problems & Compatibility

The 5.5-litre and 6.0-litre twin-turbocharged V12 petrol engine fitted to flagship Mercedes-Benz models from 2002 to 2017, including the S-Class, CL-Class, and SL-Class. Reconditioned Mercedes M275 units are typically available from £8,000 , reflecting the specialist nature of V12 replacement and consistent demand for this high-performance platform.

Supply & FitAvailable
12-MonthWarranty
NationwideDelivery
100+Suppliers
Used from£4,000
Reconditioned from£8,000
Rebuilt from£12,000
Mercedes M275 engine replacement UK - reconditioned and rebuilt prices

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Key Specs

Mercedes M275 Specifications at a Glance

Key technical details for the Mercedes-Benz M275 engine, including performance, fitment and replacement information.

Engine Code
M275 (M275.950, M275.960, M275.980)
Fuel
Petrol
Configuration
5.5L / 6.0L V12 twin-turbocharged
Power Output(s)
368kW (500hp) - 463kW (630hp) depending on variant
Years Produced
2002-2017
UK Models Fitted
4+ Mercedes models - full list in Compatibility below
Replaced
M137
Replaced By
M279
Most Common Failure
Turbocharger wastegate rattle and high-pressure fuel pump wear
Reconditioned Price Range
£8,000-£14,000 supply-only

Fitted To

Which Mercedes Models Use the M275-

TAG: Fitted To

ModelGeneration / ChassisBadge(s)YearsView model
S-Class
W220 (Facelift)S 6002002-2005
S-Class
W221S 600, S 65 AMG2005-2013
S-Class
W222S 600, S 65 AMG2014-2017
CL-Class
C215 (Facelift)CL 6002002-2006
—
CL-Class
C216CL 600, CL 65 AMG2006-2014
—
SL-Class
R230SL 600, SL 65 AMG2003-2011
—
Maybach
W24057, 62, 57 S, 62 S2002-2012
—

Prices

Mercedes M275 Engine Replacement Cost (UK)

Compare typical prices for used, reconditioned and rebuilt M275 engines, with or without fitting by an independent specialist.

ConditionSupply onlyFittedTypical warranty
Used£4,000-£8,000£5,200-£9,6003-6 months
Reconditioned£8,000-£14,000£9,200-£15,60012-24 months
Rebuilt£12,000-£18,000£13,200-£19,60012-24 months

What affects the price?

The final cost of a Mercedes M275 engine replacement is heavily influenced by the condition of the twin turbochargers and the high-pressure fuel delivery system. If turbo failure has caused internal oil contamination or if the high-pressure fuel pumps have degraded, a standard reconditioned swap may not suffice, pushing the requirement toward a fully rebuilt unit with upgraded thermal management components. See our full reconditioned engine cost guide for a detailed breakdown of what is included at each price tier.

Get M275 quotes from UK specialists
The final cost of a Mercedes M275 engine replacement is heavily influenced by the condition of the twin turbochargers and the high-pressure fuel delivery system. If turbo failure has caused internal oil contamination or if the high-pressure fuel pumps have degraded, a standard reconditioned swap may not suffice, pushing the requirement toward a fully rebuilt unit with upgraded thermal management components. See our full reconditioned engine cost guide for a detailed breakdown of what is included at each price tier. Fitted prices include the supply price and indicative labour band above. Compare with confidence

Known Problems

Mercedes M275 Engine Problems - What Actually Fails

01

Turbocharger Wastegate Rattle and Bearing Wear

Typical onset60,000-100,000 miles

What happensThe M275's twin turbochargers are prone to wastegate actuator wear and bearing degradation. This manifests as a distinct metallic rattling noise on deceleration, boost pressure faults, and eventually, oil consumption or blue smoke if the internal seals fail and allow oil into the intake or exhaust tract.

Repair vs replaceEarly wastegate rattle can sometimes be addressed with actuator replacement or repair kits. However, if bearing wear has led to oil ingestion and internal engine scoring, a full Mercedes M275 engine replacement is the only reliable solution.

02

High-Pressure Fuel Pump (HPFP) and Injector Wear

Typical onset70,000-120,000 miles

What happensThe direct-injection variants (later W221/W222 applications) and even port-injected early models can suffer from HPFP wear or injector seal degradation. This leads to rough idle, misfires, extended cranking times, and in severe cases, fuel dilution of the engine oil, which compromises lubrication.

Repair vs replaceIndividual pump or injector replacement is the standard fix. However, if fuel dilution has gone unnoticed and caused crankshaft bearing wear, a full rebuild is necessary to prevent catastrophic bottom-end failure.

Good to know

Compare rebuilt M275 prices with the failure already addressed

Engine Variants

M275 Sub-Codes Explained Which One Is in Your Car-

The M275 family covers several raw sub-codes that share the same core 90-degree V12 twin-turbo architecture but differ by displacement, output calibration, and application (standard flagship vs. AMG/Maybach). Identifying your exact sub-code is critical, as components like the ECU, turbo plumbing, and engine mounts are not universally interchangeable. - Fitted to: Mercedes S-Class (W220 Facelift S 600), CL-Class (C215 Facelift) - Key technical difference: The initial 5.5-litre iteration of the M275, featuring port fuel injection and a specific early-generation engine management calibration. - Sub-code-specific failure note: Shares the family turbo wastegate rattle pattern; early turbo actuators are particularly prone to wear. - Interchange note: Not a straight swap with the 6.0L variants; the ECU, wiring loom, and exhaust manifolds differ significantly. - Fitted to: Mercedes S-Class (W221 S 600/S 65), CL-Class (C216) , SL-Class (R230) - Key technical difference: The most widely produced M275 variant, featuring updated turbochargers, revised cooling pathways, and in later W221 models, a transition to direct injection (CGI) in some markets, though primarily port-injected in the UK. - Sub-code-specific failure note: Shares the family pattern; HPFP wear becomes a more prominent consideration on higher-mileage W221 examples. - Interchange note: Requires the correct variant-specific engine mounts and transmission bell housing alignment; not universally interchangeable between S-Class and SL-Class without bracket modifications. - Fitted to: Maybach (W240) , S 65 AMG (W221/W222), CL 65 AMG (C216) - Key technical difference: The high-output AMG and Maybach specification, featuring larger twin turbochargers, upgraded intercoolers, and a heavily reinforced bottom end to handle extreme torque loads. - Sub-code-specific failure note: Shares the family pattern, though the extreme thermal loads on AMG/Maybach applications can accelerate turbo bearing wear if oil change intervals are extended beyond 5,000 miles.

M275 engine

M275

Engine codeConfirm the exact specification for your vehicle before ordering.

Where to find the code

Check the engine block, vehicle registration document, or manufacturer records to confirm the M275 code.

Engine blockFront face near the timing cover or driver's side.
V5C documentUnder “Engine number”.
VIN decoderConfirm the exact factory build code.

Check the exact revision

Engines with similar names can have different fitment, electronics, or emissions equipment.

10E4EOriginal engine code
10E4FLater revision (2020+)
10S4GNaturally aspirated

Why the exact match matters

Confirm the complete engine code and compatibility before ordering a replacement engine.

Not sure?The M275 engine code is stamped on a machined pad on the engine block, typically near the oil filter housing or the bell housing. It is also clearly listed on your vehicle's V5C registration document under "Engine Number". Enter your registration above to confirm your exact M275 fitment before any quotes are sent.

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Buying Guide

Buying a Replacement Mercedes M275 - What to Choose

Used

A used Mercedes M275 is only advisable for lower-mileage host vehicles and *only* if accompanied by documented, stamped service history proving rigorous oil changes (every 5,000-8,000 miles, not the standard 10,000+) and no prior turbo or HPFP issues. The risk of inheriting thermal degradation or oil starvation damage is unacceptably high without this proof.

View Used engines
Recommended

Reconditioned

This is the most recommended route for the M275. A proper reconditioned unit will include brand-new or upgraded twin turbochargers, refreshed HPFP components, and new valve cover gaskets, directly addressing the V12's known weak points out of the box.

View Reconditioned engines

Rebuilt

A full rebuild is justified if your original M275 suffered catastrophic turbo failure that scored the cylinder walls, or if severe fuel dilution damaged the crankshaft bearings. A specialist rebuild will machine the block, fit upgraded thermal management components, and ensure all oil galleries are clear.

View Rebuilt engines

Supply & fit availableSourcing a replacement is only half the job. Our network provides full supply and fit services, ensuring the engine is installed by Mercedes and V12-specialist technicians with a nationwide warranty backing both the labour and the unit.

Nationwide delivery12-month warranty

Vehicle value considerationsFor flagship hosts like the W221 S-Class or C216 CL-Class, current UK market values typically sit between £8,000 and £25,000 . With a reconditioned M275 replacement costing from £8,000 (plus £1,200-£1,600 fitting), the repair cost can represent 40-60% of the vehicle's value. While financially viable for well-maintained examples, we strongly advise evaluating the car's overall condition and scrap value before committing to a V12 engine replacement on sub-£10,000 hosts.

Compare M275 Engine Prices…

Related Engines

Review related engine codes and confirm the exact fitment before ordering a replacement.

Predecessor

M137

Related engine

The naturally aspirated 5.8L V12 the M275 replaced, which lacked turbochargers and featured a completely different intake and exhaust architecture, avoiding the M275's turbo-specific vulnerabilities.

View M137
Successor

M279

Direct replacement

- The direct successor introduced in 2014, featuring twin-scroll turbochargers, direct injection, and a revised cooling system, largely resolving the early M275's turbo actuator and thermal management weaknesses.

View M279
Sibling

M278

Related engine

- The 4.6L/5.5L V8 twin-turbo counterpart of the same modular family; owners of V8-powered S-Class, CL-Class, or SL models should look here, as the M278 shares the same turbo and fuel system architecture but differs in displacement and mounting.

View M278

Important note: Always match the full M275engine code with your vehicle before ordering.

FAQ

Mercedes M275 - Frequently Asked Questions

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Get a free, no-obligation comparison for your exact Mercedes M275 engine code and sub-code. Our registration lookup confirms your precise fitment before any quotes are sent, ensuring you receive accurate pricing for your specific vehicle. With reconditioned M275 units starting from an estimated £8,000, comparing specialist quotes takes just two minutes and could save you thousands on your replacement.

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