To what capacity should oil sample jars be filled?

Filling oil sample jars to a capacity of 3/4 full is recommended for several important reasons. This amount allows sufficient headspace in the container, which is crucial for the formation of a vapor phase. The vapor phase can help prevent the oil from being contaminated by external factors such as air and moisture, both of which can alter the chemical composition and properties of the oil sample.

Additionally, a 3/4 full jar enables proper mixing and sampling without the risk of overflow or loss of sample during transportation or handling. It also leaves room for some potential expansion of the oil due to temperature changes, minimizing the risk of leaks or breakage.

This approach aligns with industry best practices for maintaining the integrity of oil samples, ensuring that analyses conducted will yield accurate and reliable results.