Depend yan TS...
Kung bago pa stick to Yamaha muna o any mineral oils recommend weight sa manual... Kung umbabot na 1.8-2k+ pwede na sa semi-synt o full synthetic (castrol, mobile, etc)... Kung high(bundok) o malamig area ka 5-15 cold weight tapos 30-40+ regular weight.. Kung endi namn pwede 5-20(optional yung 5-10 cold weight unless gusto mo talaga) cold weight tapos 30-40+.. Kung long rider ka o city drive 40+ regular weight ang hanapin muna at kahit anung cold weight na swak sa area mo. .
Cold weight yan po yung weight kung cold start o endi pa na warm up yung makina..
Regular weight yan po yung weight kung upto temperature na...higher yung number the better para endi agad mag boil yung oil(ninipis) at mag cause ng overheat