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I don't use synthetic oils. I'm convinced they are as good, perhaps a tiny bit better for most applications, considerably better for extreme cold, but not worth the cost for my applications. And Mark (and several other posters on this forum) is a dyed in the wool Amsoil fan, and apparently for good reasons. However, if I remember right, Mark has said in the past that he doesn't know that Amsoil is better than some of the other synthetics.
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