What should be used to collect oil samples according to ASTM D3613?

The method for collecting oil samples according to ASTM D3613 necessitates utilizing a sealed syringe or a stainless steel bottle. This requirement is crucial because these materials help ensure that the sample remains uncontaminated and preserves its integrity for accurate analysis.

Sealed syringes prevent exposure to air, which could introduce moisture or contaminants that may alter the chemical properties of the oil. Similarly, using a stainless steel bottle minimizes the risk of chemical reactions that could occur with certain plastics, thus ensuring that the samples reflect the true condition of the oil being tested.

In contrast, using materials such as glass flasks, plastic bottles, or cylindrical containers may not provide the same level of assurance against contamination or chemical interaction, making them less suitable for obtaining reliable oil samples per the ASTM D3613 standard.