Sediment in lubricating oil can damage mechanical systems, leading to unexpected failures

 Sediment in lubricating oil can damage mechanical systems, leading to unexpected failures. The ASTM D2273 test measures the amount of sediment in lubricating oils. The test involves mixing a sample with solvent, centrifuging it, decanting it, and repeating the process until a constant sediment level is reached. The results are reported as a percentage of sediment by volume. 

Here are some things to know about lube oil sediment: 

Sediment location: Sediment tends to settle at the bottom of the oil tank or sump. When taking an oil sample, it's best to avoid catching the first oil that comes out, as it may not be representative of the entire oil system. 

Sediment causes: Some common causes of oil degradation include: 

Oxidation: When oil molecules react with oxygen molecules, it can lead to the formation of sludge, varnish, and sediment. 

Thermal breakdown: The lubricant's temperature should be a primary concern. 

Micro-dieseling: This process occurs when an air bubble transitions from a low-pressure region to a high-pressure zone. 

Additive depletion: Most additive packages are designed to be used up during the life of the oil. 

Contamination: Dirt, water, and air can all contribute to the degradation of lubricant. 

Sediment effects: Excessive amounts of sediment in oil can lead to system malfunction.