I don't quite understand this topic. I never produce any oil to recycle, because I never change oil, any more.The simple solution to this, is to use the Synlube oil.Have now been driving more than 54000 kilometers with this oil in one car, and have started to use it in my other car.Seem to work really well, even though the one with the highest mileage is an old diesel.
I must admit though, that I was a bit sceptic before I started.