How do I clean/wash dissolved carbon from old engine oil ?

Question

How do I clean/wash dissolved carbon from old engine oil ?

Answer 1

fractional distillation

Answer 2

The best way to clean used motor oil is a process known as fractional distillation.  Basically you are heating the oil to its boiling point and removing the pure product from the top of the vessel and letting the heavier compounds remain.  Like a distillery for alcohol but you do not get to drink it