Mercedes C43 W205 complete engine M276.823 287KW/390hp 58tkm.

M276.823 engine from the Mercedes-AMG C43 (W205) is a highly sought-after 3.0L V6 Biturbo unit. The specific output of 287kW (390hp) indicates this engine comes from the Facelift (FL) model (produced from roughly 2018–2021), which featured larger turbochargers and updated software compared to the earlier 362hp versions.

With 58,000 km (58tkm), this engine is considered “low mileage” for the 2026 market, as it is just entering its prime operating window.

1. Technical Specifications

• Engine Code: M276.823 (DE 30 AL)

• Configuration: 60° V6 Biturbo

• Power: 287 kW / 390 hp

• Torque: 520 Nm

• Application: W205 C43 AMG Facelift, also found in certain X253 GLC 43 models.

• Key Feature: The “Nanoslide” cylinder coating and the 2.1 bar boost pressure (Facelift specific).

2. 2026 Market Valuation (Estimated USD/EUR)

Pricing for a complete M276.823 varies based on whether it is “dressed” (includes turbos, alternator, AC compressor) or a “long block.”

3. The 2026 “Must-Check” List

Even at 58,000 km, there are specific M276 issues that should be inspected before purchasing or installing:

• Turbocharger Wastegates: On the 390hp models, the wastegate actuators can occasionally rattle or develop play. Check for any side-to-side movement in the linkage.

• Camshaft Adjusters & Tensioners: While improved over the earlier M271/M272, the M276 can still exhibit a brief “clatter” on cold starts. In 2026, most specialists recommend installing the Check Valves (small inserts) in the oil feed lines to prevent drain-back.

• High-Pressure Fuel Pump (HPFP): Listen for a loud “ticking” that sounds like a diesel. While normal to some extent, excessive noise indicates the HPFP is nearing the end of its life.

• Cylinder Scoring: Although rare with Nanoslide, it is always wise to perform a quick borescope of the cylinders to ensure the walls are pristine.

4. Installation & Compatibility

• ECU Pairing: This engine uses the Bosch MED17.7.5 engine management system. If you are swapping this into a pre-facelift (362hp) C43, the hardware is compatible, but you must use your original wiring harness and have the ECU re-coded to handle the facelift’s turbo characteristics.

• Oil Cooler: If the previous engine suffered a mechanical failure (metal shavings), you must replace the oil cooler. The M276 oil cooler cannot be effectively flushed of debris.

• AWD Clearance: Ensure the oil pan is the 4MATIC version (specific to the C43/GLC43), as it has an integrated pass-through for the front axle.