::Engine Oil 108:: Why Shear Stability is Important? How does an oil lose some of it’s viscosity in an engine? Shear stability is a measure of the amount of viscosity an oil may lose during operation. Oil experiences very high stresses in certain areas of the engine such as in the oil pump, cam shaft area , piston rings, and any other areas where two mating surface areas squeeze the oil film out momentarily . Most multigrade engine oils contain special types of additives, called Viscosity Index improvers, which are composed of very large, viscosity-controlling molecules. As the oil passes through the engine, these molecules are permanently sheared or torn apart over time, causing the additive to lose its viscosity-contributing advantages which reduces the oils ability to maintain its higher number. ie.. 10w30 source - BITOG p/s: sebab tu HDEO Petro-Canada adalah dari jenis HighTemperatureHighShear (HTHS) sarjantulang
Posted on: Thu, 17 Apr 2014 02:31:22 +0000
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