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I thought there was a thread about this- probably about a year ago. Somebody asked about Warren Performance Proucts-and they buy oil from all the major oil companies..They do all their own blending to customer specs, as they bottle more than just Super Tech....
I had never seen the W and smaller NE on the bottles until recently,it at the moment is only on the quart bottles.The bottles are made a little different too.
ST is made,at least was made by Warren Performance Products which also makes the Mag1 brand and Polar brand.
ST has also been reported to be made by Exxon/Mobil and the Shell copmany.
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