How to identify engine oil

The identification of the use of engine oil is the basis for determining whether it is necessary to change the engine oil. How to identify it?

搓捻 Identify a little oil from the oil pan and place it on your finger. In case of stickiness, if there is a sticky feeling and there is a phenomenon of drawing, it means that the engine oil has not deteriorated and can still be used, otherwise it should be replaced.

The oil dipstick is used to identify whether the oil scale is drawn to the light and the scale is clear. When the oil on the dipstick cannot be clearly marked, it indicates that the oil is dirty and needs to be replaced immediately.

The dumping discriminates that a small amount of oil in the oil pan is injected into a container and then slowly pours out of the container to observe the luster and viscosity of the oil stream. If the oil flow can maintain a slender and even, indicating that there is no gum and impurities in the oil, it can be used for a period of time, otherwise it should be replaced.

Check the oil droplets on the white paper with a drop of oil in the oil pan. If the center of the oil droplet is dark, it is dark brown and uniform without particles. The surrounding yellow infiltration is very small, which means that the engine oil should be replaced. If the center of the oil drop is small and the color is light, the surrounding yellow infiltration marks are large, indicating that the oil can be used.

The above inspections should be carried out when the oil has not yet settled after the engine is stopped. Otherwise, the correct conclusion may not be obtained. Because the oil is precipitated, the oil floating on it is often a good oil, and the deteriorating oil or impurities remain at the bottom of the oil pan. Therefore, sampling "surface oil" may cause false detections.

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