The viscosity of motor oils simply means how thick the fluids are, which determines how well they flow or resist flow. The thicker the fluid, the more slowly it moves. For example, water has a low viscosity, which enables it to pour quickly. On the other hand, honey is thicker and has a higher viscosity, which causes it to pour more slowly. The numbers on a container of oil display the thickness of each oil.

Use a label displaying 10W-40 as an example. The first number followed by the W indicates the viscosity when the engine is cold. The second number indicates the fluid viscosity once the oil travels through a hot engine. Lower viscosity oils are necessary when the engine is cold to ensure their circulation through the engine. High viscosity oils are needed when the engine is hot. However, they must maintain a certain thickness in order to provide optimal lubrication. See us at Wynn Volvo Cars Norristown for your next oil change.

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