The publication of a new application report on the Rigaku Supermini200 describes the analysis of unused lubricating oils and additives for a variety of inorganic elements following ASTM method. The report covers sample preparation, method calibration and repeatability analysis. The composition of lubricant oils and their additives has a significant effect on their functional properties. As the desired performance specifications of these lubricants have become tighter, the need for precise, accurate analysis has increased. Wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) is displacing wet chemistry and other laborintensive analytical techniques, but typical floor-standing units have special space and facility requirements, including electrical power and cooling water. The Supermini200 offers comparable precision and resolution, as well as excellent sensitivity for light elements, in a lower-cost benchtop package, giving lubricant and additive manufacturers a compact and convenient alternative to the large, high-power WDXRF systems.