Mercedes M275 Engine - Replacement Cost, Problems & CompatibilityProblems & 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.
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Mercedes M275 - Specifications at a Glance
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Minimum 12-month warranty on reconditioned and rebuilt options
Which Mercedes Models Use the M275-
| Model | Generation/Chassis | Badge(s) | Years | Link |
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M275 is documented across 0 BMW applications spanning . Registration lookup confirms the exact suffix before quotes are sent.
Not sure which engine your car has- Enter your registration above - we'll confirm your exact M275 fitment before any quotes are sent.
Mercedes M275 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
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All pricing guidance shown here is indicative.
Fitting a Mercedes M275 typically takes 18-24 hours at £65/hr (independent specialist rate) - confirm exact labour when comparing quotes, as V12 engine bay access requires significant front-end and ancillary disassembly.
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Mercedes M275 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the M275, based on real-world data and verified failure patterns.
Real-world failure data and repair guidance from UK specialists.
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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. #### M275.950 - 5.5L V12 Twin-Turbo (368kW / 500hp), 2002-2006 - **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. #### M275.960 - 5.5L / 6.0L V12 Twin-Turbo (380kW-450kW), 2005-2013 - **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. #### M275.980 - 6.0L V12 Twin-Turbo (463kW / 630hp), 2002-2017 - **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. - **Interchange note:** Completely incompatible with standard S600/CL600 applications due to different ECU architecture, turbo plumbing, and exhaust routing.
**HOW TO CONFIRM YOUR CODE:** 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.
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.
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.
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.
Confirm the exact M275 fitment
**HOW TO CONFIRM YOUR CODE:** 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.
Buying a Replacement Mercedes M275 - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
Reconditioned:
Rebuilt:
Supply & Fit Line:
Vehicle Value Note:
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Engines Related to the Mercedes M275
Explore engines that are closely related to the Mercedes M275, including its predecessor, successor, and key family variants.
M137
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.
M279
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.
M278
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.
Mercedes M275Frequently Asked Questions
Question 1How much does a Mercedes M275 engine replacement cost in the UK-
A Mercedes M275 engine replacement typically costs between £8,000 and £14,000 for a reconditioned supply-only unit . Fitted costs generally add £1,200-£1,600 for independent specialist labour due to V12 complexity, and fully rebuilt units with upgraded thermal management components can reach £12,000-£18,000 supply-only.
- Fitted costs generally add £1,200-£1,600 for independent specialist labour due to V12 complexity.
- Fully rebuilt units with upgraded thermal management components can reach £12,000-£18,000 supply-only.
Question 2What is the most common failure with the Mercedes M275 engine-
The most documented failure patterns for the M275 are turbocharger wastegate rattle/bearing wear and high-pressure fuel pump (HPFP) degradation. Early warning signs include a metallic rattle on deceleration, boost pressure faults, or rough idle and extended cranking times, and if turbo bearing wear leads to oil ingestion, or fuel dilution damages the crankshaft bearings, a full engine replacement is required.
- Early warning signs include a metallic rattle on deceleration, boost pressure faults, or rough idle and extended cranking times.
- If turbo bearing wear leads to oil ingestion, or fuel dilution damages the crankshaft bearings, a full engine replacement is required.
Question 3Which Mercedes models use the M275 engine-
The M275 is fitted to Mercedes-Benz flagship models from 2002 to 2017, including the S-Class (W220, W221, W222), CL-Class (C215, C216), SL-Class (R230), and Maybach (W240). It powers badges ranging from the S 600 and CL 600 to the S 65 AMG and Maybach 62, and you should always verify your exact sub-code via registration lookup before ordering parts.
- It powers badges ranging from the S 600 and CL 600 to the S 65 AMG and Maybach 62.
- You should always verify your exact sub-code via registration lookup before ordering parts.
Question 4Should I buy a used or reconditioned Mercedes M275 engine-
A reconditioned Mercedes M275 is strongly recommended over a used unit due to the well-documented turbocharger and HPFP failure risks. Used units carry a high probability of inheriting the same latent thermal degradation or oil starvation damage unless accompanied by stamped proof of preventative turbo/HPFP replacement, whereas a proper reconditioned M275 includes new or upgraded twin turbochargers, refreshed HPFP components, and new valve cover gaskets as standard.
- Used units carry a high probability of inheriting the same latent thermal degradation or oil starvation damage unless accompanied by stamped proof of preventative turbo/HPFP replacement.
- A proper reconditioned M275 includes new or upgraded twin turbochargers, refreshed HPFP components, and new valve cover gaskets as standard.
Question 5What is the difference between the M275.950, M275.960, and M275.980-
The M275.950 is the early 5.5L variant, the M275.960 is the widely produced 5.5L/6.0L standard variant, and the M275.980 is the high-output 6.0L AMG and Maybach specification. While they share the same core 90-degree V12 twin-turbo architecture, they differ in displacement, turbo sizing, and ECU calibration, meaning fitting a .950 or .980 as a direct replacement for a .960 will result in severe ECU, wiring loom, and exhaust manifold incompatibilities.
- While they share the same core 90-degree V12 twin-turbo architecture, they differ in displacement, turbo sizing, and ECU calibration.
- Fitting a .950 or .980 as a direct replacement for a .960 will result in severe ECU, wiring loom, and exhaust manifold incompatibilities.
Compare Mercedes M275 Engine Prices Today
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.
Vetted UK specialists for M275 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide delivery plus supply and fit availability
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
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