how much gear oil

Yes, most cases say right on them, 650ml. The manual says Yamalube 4 (10w-30) and SAE 10w-30 Type SE motor oil.
 
Can i use sae10-w30 se motor oil? The closest cycle center is an hour away from me can I find oil that will work at a Walmart or AutoZone that wont burn my clutches up?

Anything but high mileage, friction modifiers, or above SM rating. Can also use ATF, but have to change more often. I use Shell Rotella Diesel 15-40 $5.00 a qt at Wally World