The primary importance of oil viscosity:
"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."
Looking at the viscosity graphs for oils that are true full synthetics show a wide range of viscosities which means the high viscosity ones have viscosity modifiers added to the mix to...
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"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."
Looking at the viscosity graphs for oils that are true full synthetics show a wide range of viscosities which means the high viscosity ones have viscosity modifiers added to the mix to...
Read more