Changing the trans oil on my Yamaha Blaster 200. It calls for yamalube 4 or sae 10w30. But isn't sae 10w30 motor oil and not trans oil?

Update: Is it motor oil I'm putting in this thing or is it transmision oil, because I can't find a sae 10w30 in trans oil...please explain why it says change the trans oil if its really motor oil.
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