Absorption spectroscopy is a laboratory method used to analyze used engine oils and transmission fluids. The tester shines a light source through a fluid sample and records which light wavelengths are absorbed. Since different chemicals block distinct light waves, this test identifies exactly what is in the fluid.
This method reveals soot, glycol leaks, fuel dilution, and metal particles. By tracking these variables, technicians can predict wear in bearings, cylinder walls, and gears. It lets you spot internal problems without taking the engine apart.
For heavy fleet maintenance, spectroscopy is a vital tool. It helps determine if oil can run longer or needs immediate replacement. This keeps equipment running and prevents unexpected failures on the road.