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Originally Posted by II kings 9:20
I was not aware it was a lesser product which if true means it is similar to all the other synthetics except Redline and Royal Purple and Amsoil's own 2000.
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Yes, I was on Performancempg's web site and found a notice of formulation change for their XL-7500 series oils. They changed because of having to pass some standard (API) for car manufacturers or something, but basically stated they are using re-processed petro oil, and then went on to make a case for it being legally "synthetic" by citing a decision of some court case.
They cited using GROUP III base oils. See the article here:
http://www.performancempg.com/changes_xl-7500.htm
I don't readily see a date on the article.
