just like with any product there is only a few major players. i wouldnt be surpised if QS or Valv, or even Penz made wal-marts syn oil. same thing with mopar and motorcraft oil, they have someone make that for them, exactly who, im not sure but i bet its one of the top 5 manufacturers. QS, Valv, Penz, Havl or Mobil.
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