Thanks bro. I give it a go. Somehow, I still cannot settle on a brand of oil yet.

I tried,

Normal Shell (mineral) with a variety of viscosity - all the semut lari after 500km
Rimula R4x - semut lari dekat 1k km
Rimula R5 - semut... 1.5 k km++
Rimula R6 semut all the way to 2k km
Motul 5100 - semut (just change), not sure ori
Shell Advance Long ride - i go cuba next oc.
Motul 7100 - next change after Long ride.. cuba nasib ori