Mineral engine oil is a lubricating oil extracted from petroleum. Suitable for small cars, small cars and economical and useful cars. Mineral engine oil is a good choice for cars with low mileage, such as the frequency of use within 5 thousand Km in six months. Mineral oil is the most common lubricating oil on the market at present. Although it is cheap, its service life and lubricating effect are not satisfactory. It can only play a protective role in general. In addition, there are semi-synthetic engine oil and fully synthetic engine oil. Semi-synthetic engine oil is made by refining mineral engine oil, which is the perfect transition from mineral oil to synthetic oil. Moderate performance and moderate price. Fully synthetic engine oil is artificial oil, which has excellent lubricity and high and low temperature adaptability, but the price is the most expensive. Generally, fully synthetic engine oil is replaced every 1, kilometers or 1 year, semi-synthetic engine oil every 7,5 kilometers or 7-8 months, and mineral engine oil every 5, kilometers or 6 months.