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Does anybody use the re-refined oil motor oil from Safety Kleen or Universal Lubricants? What are other alternatives for re-refined motor oil other than these two? Which one is better? How does it compare(in terms of cost and performance) to virgin Oil?

I am looking to find some updated market data on Oil Re-refining. How many Oil Re-refineries are there in US? Can I use re-refined oil for my Camry?