The M276 engine is known to develop oil leaks from various seals and gaskets, which can lead to reduced performance and potential engine damage if not addressed.

The timing chains on the M276 engine can stretch over time, causing poor engine performance and potentially leading to costly repairs if they fail.

Given the engine's turbocharged configuration, issues such as turbo lag, boost leaks, or even turbocharger failure can occur, leading to reduced power and efficiency.

Direct Fuel Injection (DFI) engines like the M276 can suffer from carbon buildup on intake valves, which can lead to rough idling, misfires, and decreased fuel efficiency.

The cooling system in this engine can develop leaks or the water pump may fail, which can lead to overheating and severe engine damage.

Fuel injectors can become clogged or fail, causing misfires, poor fuel economy, and rough engine operation.

Various electronic sensors such as the MAF (Mass Air Flow), O2 (Oxygen), and MAP (Manifold Absolute Pressure) sensors can fail, leading to incorrect fuel mixture and poor engine performance.

A failing crankshaft position sensor can cause the engine to stall or not start at all, as it is crucial for ignition timing.

The EGR valve can become clogged or fail, leading to increased emissions, rough idling, and decreased fuel economy.

With a V6 configuration, misfires can occur due to ignition coil failures, spark plug issues, or air/fuel mixture problems, affecting engine smoothness and performance.

Brake fluid leaks can occur in the Dynamic Brake Support (DBS) system, leading to reduced braking efficiency.

In-line configurations can sometimes suffer from cooling issues, especially under heavy load or in hot climates, leading to engine overheating.

A 4-cylinder engine might experience misfiring due to issues with spark plugs, ignition coils, or fuel injectors.

Mercedes-Benz engines, including the one in the 2017 SLC-Class, might have issues with the timing chain, causing rough running or engine damage if not addressed.

If equipped with a turbocharger, the engine might experience issues with the turbo, such as oil leaks or bearing wear.

Fuel pump or fuel filter issues can lead to poor engine performance or stalling.

Common in many vehicles, oil leaks can occur around the valve cover gasket or oil pan gasket, leading to potential engine damage if not addressed.

Although not directly related to the engine, Mercedes-Benz vehicles can sometimes have transmission issues, such as rough shifting or failure, which can affect overall performance.

Issues with the ECU can lead to various engine performance problems, including poor fuel economy and reduced power.