First, the color discrimination law:

Remove a small amount of colorless oil served in a container, the observation of its color. Normal for the brown and blue-black. If the milk was yellow, it indicates that the incorporation of a dieseloil or water, should be replaced. If the dark black, it indicates that the oil has changed, must be promptly replaced.

Second, the oil spot method:

Stir the complete set of oil drops on white paper (preferably filter paper), the formation of oil spot, oil spot from the center out after about 2 to 3 hours of gradually spread, forming three concentric rings. According to these three areas of color, width and shape can identify the status of the oil.

Third, the twist grinding method:

Remove from the oil a little lower shell oil, painted on your finger twist with your fingers and thumb grinding. If there are impurities in the oil or non-sticky feeling like water, and even astringent or sour taste, the oil has changed. If the twist after the mill to see the small finger on shiny metal grinding, then more serious wear and tear of engine parts, but also that the oil must be immediately replaced.
 
 



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