Of chief concern are potential fluctuations in temperature, which, as evidenced by the above anecdote, can have real-world implications. Rather, the viscosity varies as a function of other parameters. The viscosity of an oil sample can be difficult to determine because it is not a single value. Yet viscosity testing is not always straightforward, and there are certain challenges that specifically arise when testing viscosity in oil. Of the many physical parameters that can be measured in oil, viscosity-defined as a fluid’s resistance to flow-is the most important, and most commonly measured, according to Dan Walsh, technical sales director at Spectro Scientific (Chelmsford, MA). That incident is a compelling example of the need for rigorous oil testing. Subsequent analysis revealed that the oil contained a component that had turned the lubricant into jelly, says Bob McGregor of AMETEK Brookfield (Middleboro, MA). More than 2,000 cars lost their engines that morning. When people started their cars on the following Monday morning, the oil pumps were unable to suck up oil to lubricate the engines. During the winter of 1980, in Sioux Falls, South Dakota, the temperature plummeted one weekend from around freezing to -40 degrees Celsius.
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