It is usually judged empirically that if the service time is approximately 200 hours, the oil has turned black and the viscosity has become too viscous or too thin, and the oil should be replaced in time.
It can also be judged by some simple inspection methods, such as comparing the new engine oil and the engine oil in use to each other on a white paper for comparison observation. If the engine oil in use has more black spots (hard asphaltene and carbon particles), it indicates that The filter is not good, but it does not mean that the engine oil has deteriorated; if the entire drop of oil is dark brown and even without particles, it shows that it has been aged and deteriorated and should be replaced; if there is a small black spot in the middle of the oil and the color is lighter The surrounding yellow infiltration marks are large, indicating that the oil can still be used. It is worth noting that oils with additives do not have a clear boundary between the black spots in the middle of the oil drop and the yellow infiltration marks around them. There are diffusing edges, indicating that the additive has not completely failed; if the boundary is clear, the additive has been depleted. The role of oil should be replaced.
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