139QMB chinese scooter oil change question

[scoot19]

I hope this is in the right place to ask>>>  I am going to attempt to change my oil and  transmission fluid myself, I  wanted to ask what is recommended for  engine oil and gear oil for the transmission??

I did find 85-140 gear oil  and wonder if I can use that?  My scooter has 700 mi on it and I already had the  gear oil and  motor oil changed once at 317 miles. It is so cheap to change the oil and gear oil I feel it's worth doing every 800 mi or so. I plan on waiting until I get close to 1000 mi to change the gear and motor oil.
What do you recommend??

[tortoise2]

Jul 7, 2019 16:06:24 GMT -5 scoot19 said:

engine oil

Is 15W-40 NOT on a metal information plate AND suggested in the owners manual?

[scoot19]

dont see it on the plate and never had a owners manual...

[tortoise2]

[90GTVert]

I use Shell Rotella T 15W40, changed every 500 miles in the engine. For the gearbox, I go with Mobil 1 75W90. Changed every 1000-2000 miles. That is a full synthetic gear oil, so it won't be the cheapest. You'll get about 7 full changes from one bottle though.