Why does the engine sound quieter after an oil change?
2 Answers
After changing the engine oil, the lubrication capability improves, resulting in reduced engine noise. Here are some key points about engine oil: 1. Composition: Engine oil consists of base oil and additives. The base oil is the primary component that determines the fundamental properties of the lubricant, while additives play a crucial supplementary role. 2. Oil types: The SAE viscosity classification for winter oils includes grades such as 0W, 5W, 10W, and 15W. The 'W' stands for winter, and a smaller number before the W indicates lower low-temperature viscosity and better performance in colder climates. The SAE viscosity classification for summer oils includes grades like 20, 30, 40, and 50, where higher numbers represent greater viscosity and better performance in higher temperatures.
I commute every day in my small car, and recently after changing the engine oil, I noticed the engine noise has significantly decreased. The loud buzzing sound during startup has become much milder, and the ride is noticeably quieter. From what I understand, fresh oil is cleaner and can quickly lubricate internal engine components, reducing friction-related noise. Old oil, after several months of use, becomes dirty and thick, leading to poor lubrication and increased noise. Regularly changing the oil not only reduces noise but also protects the engine and extends its lifespan. I recommend developing a habit of changing the oil every six months or 5,000 miles to prevent issues from accumulating and to save fuel and hassle. This makes my daily driving more comfortable, especially during traffic jams—the absence of that minor noise even improves my mood. It’s truly an added benefit of maintenance.
