mjhpadi Posted December 28, 2011 Report Share Posted December 28, 2011 I have managed to discover that Royal Purple oil filters are manufactured by Champion Labs. These filters seem to be equal or above quality to K&N and Mobil One to mention other filters. So far it appears that these filters rank in the very good category but that is only from the limited info I have been able to find on them. Also it seems that they are only found at Pep Boys as the national chain store routinely carrying these filters. Still not a lot of firsthand info about Royal Purple oil or likes and dislikes about it. I am trying to find as much info as possible, as I am considering using these on the SHO. So any firsthand knowledge anyone can add is a plus. Link to comment Share on other sites More sharing options...
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