![]() The suction is removed, and the time it takes for the fluid to drain out is measured. Fluid is drawn up from the cup on the lower left into the tube on the right, using a suction bulb. Viscosity of liquids can be measured with a special piece of glassware called a viscometer (see Figure 1). For an engine lubricant, it is important that the viscosity does not change significantly as the temperature increases. Cooking oil has a higher viscosity-it pours more slowly than water. Water is an example of a fluid with low viscosity-it pours easily and quickly. The viscosity of a fluid is a measure of the fluid's resistance to flow. One way of measuring an oil's ability to lubricate is to measure its viscosity. The oil must be able to keep the piston moving smoothly at cold temperatures (when the engine first starts up) and also at the normally high operating temperature of the cylinders. ![]()
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