Difference between revisions of "Viscosity"
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Measurement of the thickness or denseness of a fluid. The "weight" of a motor oil is essentially its [[viscosity]], or how "thick" it is. 30-weight oil is less viscous than 40-weight oil. | Measurement of the thickness or denseness of a fluid. The more dense the fluid the more resistance to flow it exhibits. The "weight" of a motor oil is essentially its [[viscosity]], or how "thick" it is. 30-weight oil is less viscous than 40-weight oil. | ||
In multi-weight oils, such as 10W-40, the first number is the oil's "weight" at low temperatures, and the second number is the oil's "weight" at high temperatures. Multi-weight oils have mostly displaced single-weight oils in the market place because they give better lubrication at start-up, especially in cold weather, than single-weights, and yet give the same protection at higher, operating temperatures. | In multi-weight oils, such as 10W-40, the first number is the oil's "weight" at low temperatures, and the second number is the oil's "weight" at high temperatures. Multi-weight oils have mostly displaced single-weight oils in the market place because they give better lubrication at start-up, especially in cold weather, than single-weights, and yet give the same protection at higher, operating temperatures. | ||
[[Category:Definitions]] | [[Category:Definitions]] | ||
Latest revision as of 23:00, 26 November 2010
Measurement of the thickness or denseness of a fluid. The more dense the fluid the more resistance to flow it exhibits. The "weight" of a motor oil is essentially its viscosity, or how "thick" it is. 30-weight oil is less viscous than 40-weight oil.
In multi-weight oils, such as 10W-40, the first number is the oil's "weight" at low temperatures, and the second number is the oil's "weight" at high temperatures. Multi-weight oils have mostly displaced single-weight oils in the market place because they give better lubrication at start-up, especially in cold weather, than single-weights, and yet give the same protection at higher, operating temperatures.