Mercedes M272 Engine - Replacement Cost, Problems & Compatibility

A Mercedes M272 engine replacement typically costs between £3,800 and £6,500 for a reconditioned supply-only unit . Fitted costs generally add £780-£1,040 for independent specialist labour, and fully rebuilt units with upgraded balance shaft components can reach £5,500-£8,500 supply-only.

• Fitted costs generally add £780-£1,040 for independent specialist labour.
• Fully rebuilt units with upgraded balance shaft components can reach £5,500-£8,500 supply-only.

The most documented failure pattern for the M272 is balance shaft sprocket wear and timing chain stretch, typically occurring between 60,000 and 100,000 miles. Early warning signs include a distinct metallic rattling noise on cold starts and check engine lights for camshaft correlation faults, and if ignored, the chain can jump teeth, causing catastrophic valve-to-piston contact.

• Early warning signs include a distinct metallic rattling noise on cold starts and check engine lights for camshaft correlation faults.
• If ignored, the chain can jump teeth, causing catastrophic valve-to-piston contact.

The M272 is fitted to Mercedes-Benz core models from 2004 to 2011, including the C-Class (W203, W204), E-Class (W211, W212), CLK (C209), CLS (C219), S-Class (W221), and ML/GL (W164). It powers badges ranging from the C230 and E280 to the S350 and ML350, and you should always verify your exact sub-code via registration lookup before ordering parts.

• It powers badges ranging from the C230 and E280 to the S350 and ML350.
• You should always verify your exact sub-code via registration lookup before ordering parts.

A reconditioned Mercedes M272 is strongly recommended over a used unit due to the well-documented balance shaft sprocket and timing chain failure risks. Used units carry a high probability of inheriting the same latent wear unless accompanied by stamped proof of a full chain and sprocket kit replacement, whereas a proper reconditioned M272 includes new, updated balance shaft sprockets, a full timing chain kit, and refreshed cooling components as standard.

• Used units carry a high probability of inheriting the same latent wear unless accompanied by stamped proof of a full chain and sprocket kit replacement.
• A proper reconditioned M272 includes new, updated balance shaft sprockets, a full timing chain kit, and refreshed cooling components as standard.

The M272.920 is a 2.5L variant, the M272.940 is a 3.0L variant, and the M272.950/M272.960 are 3.5L variants. They all share the same core 90-degree V6 architecture and the same balance shaft vulnerability, but they differ in displacement, intake manifold design, and ECU calibration, meaning they are not direct interchange replacements without extensive modifications.

• They all share the same core 90-degree V6 architecture and the same balance shaft vulnerability.
• However, they differ in displacement, intake manifold design, and ECU calibration, meaning they are not direct interchange replacements without extensive modifications.