How to Verify Your System is Clean After an Oil Flush

Several options are available to verify system cleanliness after a system flush, and this article explores nine of those options.

Excavator Freeditigalphotos

Article originally published on

When performing an oil flush on your equipment, it is important to have a plan and procedures that take into account the criteria and materials used for deeming the system clean. This includes particles you cannot see with a naked eye. The width of an average human hair is approximately 40 microns, but particles as small as 2 microns can damage your system. How can you judge your system clean if you cannot see the material? There are several options.

  1. Use a laboratory
  2. Patch kits
  3. Portable particle counters
  4. Visual inspections
  5. Wye strainers
  6. Basket strainers
  7. Witch's hat strainers
  8. Bag filters
  9. Flange screens

(Read more about each of these verification options in Noria's original article, "How to Verify System Cleanliness After an Oil Flush"...)