In purely scientific terms, viscosity is a measure of a liquid’s resistance to flow. A motor oil’s viscosity ratings supply important information about how easily the product will move around inside an engine as it protects against friction and wear between the various moving parts.

An oil’s viscosity can be impacted by temperature, pressure, and the presence of contaminants that have been picked up over time. The number that appears immediately before the W in the motor oil’s designation is indicative of its viscosity under normal operating conditions. This number will be a multiple of five and is generally between zero and 25 for commercially available products. A lower number indicates lower viscosity and a faster flow rate than a higher number.

If you have questions about which motor oil is right for your vehicle, consult the owner’s manual or contact the service center at Gengras Volvo in East Hartford, CT for additional information.

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