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Selecting Engine Oil By Viscosity
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[QUOTE="jaguar, post: 1480391, member: 19340"] Here's some quotes emphasizing how viscosity is of primary importance: Viscosity is the single most important physical property of a lubricant. It is a crude measure of a lubricant's molecular constitution from the standpoint of hydrocarbon chain size. Viscosity determines film thickness and film strength. [URL="http://www.machinerylubrication.com/Read/28956/lubricant-viscosity-index"]Don't Ignore Viscosity Index When Selecting a Lubricant[/URL] Viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. [URL="http://www.engineeringtoolbox.com/dynamic-absolute-kinematic-viscosity-d_412.html"]Viscosity - Absolute (Dynamic) vs. Kinematic[/URL] Viscosity is very important because it affects the oil's ability to reduce friction and transfer heat. [URL="http://www.oilspecifications.org/articles/what-is-viscosity.php"]What is Oil Viscosity a.k.a. Oil Weight? - oilspecifications.org[/URL] An oils first line of defense is its viscosity (thickness). The ability of the oil film to prevent contact between the rings and the cylinder is a function of an oils viscosity. Generally speaking, the more viscous or thicker an oil, the greater load it will carry. [URL]http://www.aijiuyujia.com/best-2-stroke-motorcycle-oil.pdf[/URL] To double check I spoke on the phone with Joey Cabrera at Motul and he assured me that I was on the right path by thinking that the principle consideration is the final mixed viscosity. He also assured me that viscosity index and flash point are indicators of the quality of the product. (A low flash point temperature usully indicates a fair amount of group 1 oil or added solvent.) [/QUOTE]
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MX, SX & Off-Road Discussions
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Selecting Engine Oil By Viscosity
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