Agricultural machinery oil change period

1. Compare the new agricultural machinery oil and the used agricultural machinery oil to each drop on the white filter paper. If there are more black spots in the used oil drops, it indicates that the farm machinery oil is not degenerate and should not be replaced; for example, the agricultural machine oil is Dark brown is bad and should be replaced.

2. Use two glass test tubes with a diameter of 0.5 cm and a length of 20 cm to load 19 cm of new farm machine oil and used farm machine oil respectively. Seal the two tubes and invert them at the same time to record the rising time of the bubbles. If the difference is more than 20%, it means that the viscosity of the used agricultural oil has dropped too much and should be replaced.

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