[[1]] is the common method for separation of small pieces of metal in the engine oil of a car.

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Detailed Solution

Filtration is the common method for separation of small pieces of metal in the engine oil of a car.
Filtering is the most suitable technique for separating minute pieces of metal from car engine oil. The method used to separate small, insoluble particles from the liquid is called filtration. During this process, suitable filter paper will be used to remove solid particles from a liquid. Pieces of iron stay in the filter paper, allowing oil to flow below.

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