What Causes Loud Noises During Cold Starts in BMW Vehicles?
1 Answers
Introduction to the causes of loud noises during cold starts in BMW vehicles: Engine Carbon Buildup: This occurs because old engine oil becomes increasingly thin with use, leading to more carbon deposits. Thin oil is prone to leakage, resulting in increased carbon buildup and significant power loss. When new oil is added, the engine may struggle to adapt to the oil's viscosity, potentially causing higher RPMs and consequently louder engine noises. The most effective way to reduce carbon formation is to periodically clean the vehicle's intake system at a 4S dealership. It is recommended to perform necessary cleaning of the intake system around every 30,000 kilometers. Incorrect Engine Oil Specifications: Or excessive oil levels can cause unnecessary resistance to crankshaft rotation, affecting power output and increasing fuel consumption. Carbon deposits in the cylinders, which can become red-hot, may lead to premature ignition. Additionally, carbon buildup accelerates wear on cylinders and pistons and negatively impacts oil quality. In summary, excessive oil increases the stirring resistance of the crankshaft and connecting rods, leading to louder noises. Regularly change the engine oil, maintain an appropriate oil level (generally slightly below the upper limit on the dipstick), and periodically clean or replace the oil filter cartridge.
