What is the method of identifying engine oil with a tissue?
1 Answers
The method of identifying engine oil with a tissue is: Dip the oil dipstick into the engine oil and drip it onto a tissue. The oil will spread outward, forming concentric rings with varying shades of color on the tissue. From the inside out, these rings are the deposit ring, diffusion ring, and oil ring. If the darker deposit ring is prominent, the oil needs to be changed immediately. The functions of engine oil are: 1. As a lubricant, it reduces friction and wear between moving parts; 2. As a coolant, it absorbs heat generated in the engine combustion chamber and piston top, cooling the engine and preventing overheating; 3. As a sealant, it fills the gap between the piston rings and cylinder liner to prevent leakage of combustion pressure.