No, no! I’m not talking about “how to generate money by selling underwear’s o??n the Internet” I’m talking about Jeff Paul, the super marketing guru of 90’s who shouted “How I Earn $4,000 a Day Sitting at My Kitchen Table in My Underwear?” But it’s a GONE story now. What happened to Jeff Paul, o??ne of the very successful students of “Dan Kennedy’s” the daddy of Marketing? Used motor oil which has impurities and dirt is fed right into a centrifuge. The centrifuge carries a rotor that spins an incredibly high RPM (revolutions each minute) and it pushes the impurities to the wall in the container that houses the rotor. This works because the mass from the impurities is more than the mass with the oil particles. Appropriate extraction methods are used to ensure that impurities along with the clean motor oil are properly separated, and the oil is able to be re-used. These filtering systems can also be suitable for use with small-scale biofuel setups to get rid of any impurities.