MazdaMatt-
I bet in city driving with lots of shifting, the synchros would wear faster with lighter oil. However, I have a pretty unusual driving style. Most of my driving is very long stretches of highway. I often go hundreds of miles without shifting. I have taken I-44 all the way across Missouri (290 miles) without ever shifting out of 5th or pressing the clutch. I just turn on some audio books, set the cruise control for the speed limit, and let the car putter across the country.
With this in mind, I just can't imagine when I would give my synchros a chance to wear.
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