In Reply to: Oil tested after 10 years use. posted by Larry Holbrook on December 10, 2018 at 11:31:47:
Oil doesn't break down. You can use it over and over if you can filter out the impurities. An old timer electrician once told me this and said if you take a length of cotton rope like a clothesline and set it in a can of dirty/used oil then droop it down into another container, it will slowly filter the oil out and fill up the lower container with clean oil. Its viscosity doesn't deteriorate. He said a lot of people did this but is a long time-consuming process.