What Causes the Loud Engine Noise When Starting a Mercedes GLC?

[LeAngelo]

Mercedes GLC starting with loud engine noise has the following reasons: Excessive Engine Oil: When there is too much engine oil, it creates unnecessary resistance to the crankshaft rotation, resulting in louder noise during startup, which also affects power output and increases fuel consumption. Exhaust Pipe Issues: Modifying the exhaust pipe is crucial for achieving a roaring sound in cars. Conversely, a cracked exhaust pipe can also cause loud engine noise. Damaged Engine Bearings: The noise from damaged bearings varies with the engine's maximum power output. Engine Valve Problems: If the engine noise resembles a metallic knocking sound, it may indicate issues with the engine valves, requiring professional repair.