There is a simiar thread that was just started today asking essentially the same question. I'm a fan of the Next-Gen. Its using less foreign oil in the manufacturing process, so on principal alone, its worth it for me. Also, its re-refined, not just filtered. If you think of it this way, crude is WAY dirtier when it starts the refining process. Used motor oil is way cleaner when it enteres the refining process. Also, its not the oil that breaks down over time, its the additives. I will be using this oil in the futre without worry. You can make your own choice, but IMO, you have nothing to worry about either.