How to Check the Quality of Engine Oil?

[VonKimberly]

Methods to check the quality of engine oil: Take two clean white papers and drop one drop of the same type of new engine oil and one drop of the used engine oil on each paper respectively. Pay attention to cleanliness when taking the oil. If there are more hard asphalt and carbon particles in the black spot of the used oil, it indicates that the filtering effect of the oil filter is poor, which means the filter should be replaced. If the black spot in the oil is small and light in color, with a large yellow trace around it, and the boundary of the oil trace is not very obvious and gradually diffuses, it means the oil can still be used. If the black spot is large, and the oil is dark brown, uniform without particles, and the boundary between the black spot and the surrounding yellow oil trace is clear, it means the oil has deteriorated and should be replaced in time.