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SAE Viscosity Ratings
SAE viscosity ratings in order of preference from best to worst:The best possible: SAE 0W-60 (Very expensive)The best available: SAE 5W-50 (Possible only with fully synthetic motor oil)2nd best: SAE 5W-40 for colder climates (Synthetic or Blend) SAE 10W-50 for warmer climates (Synthetic ...
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Which SAE viscosity rating is the best?
SAE 0W-60 is the best but it is now not available.Theoretically the best possible SAE viscosity rating is 0W-60, but only small experimental quantities of such lubricants were ever produced. The NASA SynLube is rated SAE 0W-60, but it sells for USD95 per liter, therefore it is not economical or practical ...
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SAE and ISO viscosity classification system
SAE --- The Society of Automotive Engineers is an engineering society founded to develop, collect, and disseminate knowledge of mobility technology.ISO viscosity classification system, approved by the International Standards Organization, for classifying industrial lubricants according to viscosity. ...
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Viscometer
Device for measuring viscosity; commonly in the form of a calibrated capillary tube through which a liquid is allowed to pass at a controlled temperature in a specified time period.
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Viscous
Possessing viscosity. From the Latin word for a sticky species of birdlime that is a slowly-pouring liquid. Frequently used to imply high viscosity.
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Relationship between Viscosity and Temperature
The manner in which the viscosity of a given fluid varies inversely with temperature. Because of the mathematical relationship that exists between these two variables, it is possible to predict graphically the viscosity of a petroleum fluid at any temperature within a limited range if the viscosities ...
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Viscosity Index Improver (VII)
Chemical additive that is added to finished lubricants to improve the viscosity index.Lubricant additive, usually a high-molecular-weight polymer, that reduces the tendency of an oil to change viscosity with temperature. Multi-grade oils, which provide effective lubrication over a broad temperature range, ...
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Viscosity Index (VI)
An arbitrary scale used to show the magnitude of viscosity changes in lubricating oils with changes in temperature. Oils with low viscosity index(VI) number such as VI=0(zero) have high dependence of viscosity change on temperature. They thicken quickly with decreasing temperature, and thin out quickly ...
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Kinematic Viscosity
Absolute viscosity of a fluid divided by its density at the same temperature of measurement. It is the measure of a fluid's resistance to flow under gravity, as determined by test method ASTM D445. To determine kinematic viscosity, a fixed volume of the test fluid is allowed to flow through a calibrated ...
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Apparent Viscosity
The ratio of shear stress to rate of shear of a non-Newtonian fluid such as lubricating grease, or a multi-grade oil, calculated from Poiseuille's equation and measured in poises. The apparent viscosity changes with changing rates of shear and temperature and must, therefore, be reported as the value ...
