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The actual viscosity difference is relatively small, "0" weight oils are more of a marketing gimmick
M1 is ok, M1 EP has a vastly improved add pack. For the money, I like Castrol Edge.
Most people don't actually research oils, it comes down to "my hick buddy said this is better and my engine hasn't blown up yet" (or similar) - very few actually get their oil tested or review standardized test results.
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