Yeah, I saw that in my owner's manual 7 yrs ago----but a 15W/40 is hard to find.
My dealer started me out on full synthetic Amsoil Scooter specific oil 10W/40.
Many old hands recommend a non synthetic oil for the break-in period....but that may have applied to engines from a different time??
I've used a synthetic for 16,000+ miles and my LIKE200i neither leaks nor uses oil between changes.
I never push past 850 or so miles between oil changes - since it requires less than a Qt. per change, and the changes are easy.
So, yeah, a 10W/40 will be fine for your LIKE.
Do give it a change after 600 miles from new!
Stig