Not true. Handbook is the one to be followed on warranty related matter.

My first 1000km service I asked for mineral oil, BigWing SA say huh, this one only 1000km need to service again.

I said just use lah, show them handbook, they kept quiet but still say next service is 2000km, with a sticker which I throw away.

1.5 liter lube with oil filter (ADV350).

Current mileage 3,500km, check oil on dip stick, still good. Engine does not feel heavy.

Now I wait for some ktards to tag me as can't afford synthetic and can't afford to maintain big bike.
   

from honda bottle of AT 10W-30, it show as fully synthetic.
im going to impian. but not regularly. not gonna follow the sticker too.