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I used to use M1 exclusively in all my vehicles. Then, they started to get cagey about whether they really were selling a true syn oil. Many (including me) believe they now sell a hydro-cracked version under the M1 brand, rather than the Group 4 formula they had been selling.
Hence, I moved to Red Line.
Who knows the truth or if there is a "truth."
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Rich Belloff
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