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Yeah it definitely runs easier than 10w-30 during a Vermont winter. 90's Civics do indeed call for either their MTF or 10w-30. Later D series dropped the motor oil recommendation but most of the internal components that matter (syncros, mostly) still had the same part numbers, so presumably one could have continued using motor oil in later transmissions.
If you're interested enough, I probably have some MTF and 10w-30 in the basement. I could throw a bit of each in a cup in the freezer and see what they do.
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