Microfiltration of oils in combustion engines in drive and hydraulic systems - research and review of solutions

The article presents the issue of the cleanliness of oils and fuels used in combustion engines of automotive and rail vehicles. In the article, after a review of the membrane separation field, attention was drawn to the possibility of using additional oil and fuel filtering systems to increase the cleanliness class. For this purpose, a methodology for testing the condition of oil and fuels in a portable laboratory in accordance with the requirements of SAE AS 4059, ISO 4406:99, and NAS 1638 standards was presented. Solutions for portable devices for microfiltration of oils and fuels by Kleenoil were presented. Additionally, the results of tests of sample new engine, gear, and hydraulic oils were presented, which, according to the cited standards, are out-of-class oils and require additional microfiltration. The novelty of the article is the presentation of a simple method for examining the condition of oil in combination with microfiltration. Both the oil condition analyzer and the microfiltration machine are portable stations for field and laboratory applications.