How to choose oil for garden tools?

For the efficiency of garden tools, we will apply oil when using garden tools. There are many on the market. How do we choose suitable oil?
1. Smell the smell.
The smell of oil is generally divided into gasoline, kerosene, diesel, alcohol, aromatic, sour and so on. The oil with additives has a certain sour taste; the oil with alcohol content has an alcoholic taste; the light solvent oil has an aromatic taste.
2. Look at the appearance.
Different types of oil have different color appearances. . Carefully observe the appearance and color of the oil. The light color is mostly light distillate and highly refined oil, and the dark color is mostly residual oil residue, oil with less refined degree, or oil with heavy distillate. .
3. Feel the soft and hard conditions and smoothness of the oil.
The refined oil hand mold has a strong smoothness, while the poorly refined oil has a poor smoothness. Grease and degree of hardness can be roughly divided into different grades. Smaller grades are softer, and larger grades are harder.
4. After shaking, observe the degree of thickness of the oil.
Shake the oil in a colorless glass bottle, and observe the phenomenon of the oil film hanging on the bottle and the occurrence and disappearance of bubbles. You can basically distinguish the different grades of the oil. Oil with low viscosity produces more bubbles, rises quickly, disappears quickly, and has fewer bottles; oil with high viscosity produces less bubbles, rises slowly, and disappears slowly, but there are more bottles of oil.