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I used M1 0W30, and I never "saw" an improvement, but I'm sure it was there. The expected improvement is much smaller than my ability to measure, and would be totally lost in the day-to-day noise in my data. The fact that I understand how and why it's expected to improve my fuel economy will have to suffice. Although, I am able to verify that a cold engine starts easier when it's got 0Wx synthetic.
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