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My recommendation is always use the oil stipulated in the owner's manual. Transmissions don't have the same circumstances as an engine. The different types of metal, the way they rub together, the pressure, the lack of exhaust gases, dust that makes its way past the air filter and gasoline contaminating the oil, not having a heat source in the same block; all this is different in a transmission.
Synchros do eventually wear out, but so does oil. If you do use a lighter oil, use one that's close to the oil specified in the manual and maybe learn to double clutch.
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