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    Which oil is best, or does it matter?

    I'm considering buying a Stihl or Shindaiwa trimmer. Stihl has their Ultra synthetic, Shindakiwa has their Red Armor synthetic, and then there is the Ambersoil Saber synthetic. Would Ambersoil be any better than the other two? If so, why? Or what about Ultra and Red Armor? Thanks for...