Oil viscosity and brands
 

What weight oil to use in these Chinese engines have a 110cc 4-wheeler and a 50cc scooter two of them? Thank you in advance!

http://www.chinariders.net/showthread.php?t=16480 had good advice

Same oil for scooter vs. 4 wheeler. Taotao atm50

Delo 15W-40 works fine in the 139QMB 50cc 4-stroke scooter engines.

Service interval guidelines.

Maintenance videos.