Mercedes M275 Engine - Replacement Cost, Problems & Compatibility

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.

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.

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.

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.

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.