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IT'S MORE THAN JUST OIL. IT'S LIQUID ENGINEERING.

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DIESEL ENGINE OIL VISCOSITY GRADES

Viscosity Grade: A Critical Performance Requirement

 

Viscosity is one of the single most important characteristics of an engine oil.

 

Castrol®’s high-quality base oils and premium additives result in oils with a high viscosity index, which is the measure of an oil’s change in viscosity based on changes in operating temperatures.

 

By definition, viscosity is the measure of a lubricant’s resistance to flow.  And in fact, flow characteristics and temperature are directly related. The higher the temperature, the more freely an oil flows; the lower the temperature, the more an oil’s flow is inhibited. This relationship can result in oil thinning as temperature increases and oil thickening as temperature decreases.

 

Oils with a high viscosity index are more resistant to excessive thinning at high temperatures and thickening at low temperatures, and, as a result, offer a wider operating range.

Castrol offers diesel engine oils in a variety of viscosity grades suited for specific applications.

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