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You are overthinking it, if we take Greece weateher in mind, the motorcycle can run any motorcycle oil from 10w40 to 20w50. Just check any Yamaha manual with the same engine you have.
The chinese manual are crappy at best and they will just list one type of oil, instead of giving you the chart of oils to use according to the weather you have.
About the 20w40, that a lot of people like to bash. These engines are really basic engines from mid 80s to early 90s, they were almost made in mind to use 20w40.
In fact Yamaha stills sells 20w40 under the yamalube brand.
Down the road, changing oil often is more important than using a ultra plus special one of a kind oil.
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