Why Does the Engine Noise Increase After an Oil Change?

[LePhoebe]

There are several reasons why engine noise may increase after an oil change: 1. Overfilling of oil: When there is too much oil in the engine, it creates unnecessary resistance to the rotation of the crankshaft, affecting power output, increasing fuel consumption, and consequently raising noise levels. 2. Unsuitable oil viscosity: If the oil viscosity is too high, the rotational resistance is greater when the engine is cold, and the lubrication is insufficient, leading to increased noise during cold starts. 3. Severe engine carbon buildup: Oil tends to thin out over time, and carbon deposits accumulate. When new oil is first changed, the engine may not immediately adapt to the oil's viscosity, resulting in louder engine noise.