Lubricants are an essential part of any industrial operation, but understanding their properties and how to properly maintain them is critical for keeping machines running smoothly. One important property of lubricants is their acid number (AN), which you can determine through simple laboratory analysis. In this blog post, we’ll provide an introduction to the AN test and explain its importance for maintaining effective lubrication programs. We’ll also discuss some of the factors that can affect AN values and offer tips for ensuring accurate results.