do you have any info or insight on how the valvoline full synthretic compares to M1? I am curious if the base stocks are similar, and if the performance is similar. I think I will use the Valvoline in the Merkun engines, but after the bad experience with castrol so-called synthetic, I am not sure I want to try it in an OM603. My 616s get so few miles that I leave them on Mobil Dino oil.

uhOh!  Nuther oel thread....


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