What is the normal color of engine oil?

[LunaDella]

Different brands of engine oil have different colors. Common engine oil colors include transparent colorless, light yellow transparent, brown transparent, red transparent, green transparent, and blue transparent. Relying solely on color to determine whether engine oil is normal is not a scientific method. Generally, if the engine oil appears clear, it is normal. If the engine oil appears cloudy, it is abnormal. Below is more information about engine oil: 1. Engine oil is divided into two main categories: mineral oil and synthetic oil. Synthetic oil is further divided into semi-synthetic oil and full synthetic oil. Among them, full synthetic oil is of the highest quality, followed by semi-synthetic oil, while mineral oil is of the lowest quality. 2. Under normal circumstances, full synthetic oil should be replaced approximately every 10,000 kilometers or once a year; semi-synthetic oil should be replaced approximately every 7,500 kilometers or every 8 months; and ordinary mineral oil should be replaced every 5,000 kilometers or every six months.