I remember back in the 70s a guy trying to sell me a stilko oil filter. It was basically a case that held a roll of toilet paper. Periodically you loosened the filter, threw away the old roll and inserted a new fresh roll of tp. Voila, you never buy another oil filter. They had a display in which they ran what was supposedly dirty oil through a fram and then through the Stilko. The fram didn't clean it up very much but the stilk brought back the out of the bottle color. I checked the web and the company apparently still exists and they still have the same display, albeit now on the web. Anyone know somebody who used one of these things? I'm not interested in buying one but I am shocked that they're still around 35 years later.