how to recycle used motoring oil ( mineral lubricant SAE grade) back to its original stage?

Answer 1

centrifuge and filter

Answer 2

Motor oil could be effective once you're having sex along with your vehicle, yet i does no longer use it even as having sex with a human. it may damage the exterior, and carry about dermatitis. a cheap (and safer) decision could be cooking oil, olive oil, toddler oil, or once you've no longer something else, vaseline. As you recognize, none of those are threat-free with a condom. wish this enables.