Oil samples should be taken on a regularly scheduled basis and should only be taken after the lubricating system or component has been operated long enough to reach operating temperature. This will ensure that the oil has been thoroughly circulated and will result in an oil sample that is truly representative of the oil in the system. The oil sample should always be taken at the same point in the system, such as from a valve mounted on an oil return line before the oil passes through the filter.
The sample container should then be sealed immediately and sent to the laboratory as soon as possible.
To properly interpret the analysis results, the laboratory should be advised as to the viscosity and type of oil, the hours or miles of service, and the make and model of the component or system from which the sample was taken. This information should be printed on a card usually provided in the oil sample carton.
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