![]() ![]() ![]() This test is carried out in a glass capillary U-tube by drawing an oil sample until it reaches the desired starting position. The Different Ways To Measure Motor Oil ViscosityĪlthough motor oil viscosity can be measured in a variety of ways, the most common method is through a capillary tube viscometer. In addition to keeping your engine running smoothly, changing your engine oil on a regular basis will help prevent major problems down the road. Oil will eventually wear down its heat-transfer capabilities, increasing wear and potentially leading to engine failure. The thickness of the oil in the engine is expressed in terms of the number after the W.Įngine oil should be changed every 7,500 miles (12,000 kilometers) or every three months, whichever comes first, whichever comes first. It is best to use a thinner oil if the number is low, as the colder the oil, the better it will perform in cold temperatures. Credit: When the temperature of the oil is lower than the value before the W, the viscosity of the oil is described in the number before the W. ![]()
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