Sliding metal components generate abrasive wear particles in the normal course of operation.
Diesel engines, gas engines, transmissions and gearboxes are all examples of applications where spin-on filter elements are used to filter the lubricating oil.
Hydraulic Systems have high heat and high pressure fluids getting pumped and pushed into many tight clearance metal on metal or sealed surfaces. Damages by abrasive metal particles causes leaks and sometimes catastrophic failures.
In many of these applications the level of filtration or absolute rating can be quite high and thus not able to provide the best level of filtration against metals until a 360MAFC is used.