So I reach the 3000 km mark. How do I replace the gear oil since the bolt are sideways. Do you guy use compress air to blow out the remaining oil? According to the manual I should not mix gear oil of different brand.
Don't change the gear oil unless you are willing to download the manual which cost nothing. Guessing introduce a problem where the was no problem to begin with.
There are ONLY two reason to change the gear oil:
1. verify the condition - no contamination, some but not an excessive amount of metal shavings.
2. quantity - there is no dipstick and if it is "low" you might have a leak. In time, if it leaks out the diff will burn up. Otherwise gear oil does not get dirty or ever wear out in this application.
Any brand will do. Don't waste money on synthetic. I use supertech from walmart. I have gone from 2600 mi to 20K miles and my scoot runs perfect. Many owners take stuff apart without the manual or proper knowlege and tools and introduce problems in something that was working perfect.