What Causes Noise After Cold Start of a Car?

1 Answers
IrisLynn
07/29/25 6:18pm
Reasons for noise after cold start of a car: 1. Oil viscosity: When the engine is cold, the oil viscosity is higher. If the selected oil is too thick, it will cause additional wear on the starter motor and battery. However, if the oil is too thin, it may not form a sufficient protective film under high-temperature conditions, leading to insufficient lubrication and increased wear on components, resulting in noise. 2. Engine carbon deposits: Over time, old oil becomes thinner, leading to an accumulation of carbon deposits. 3. Engine resonance: Slippage due to aging of the water pump belt or engine belt can cause abnormal noise, or lack of lubrication in components such as the water pump impeller, water pump bearings, or generator bearings may lead to wear and noise.
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