what is the best engine oil for a honda cb400(super four)?

[Julian A]

my service is coming up besides the engine oil change what else is compulsory in the service

 

[irkt]

Mobil 1 Synthetic for bikes, in a '98 Speed Triple.

 

[The Freak Show]

I always use Valvoline motorcycle specific in my liquid cooled bikes and Amsoil in any Harleys.

I have never had a problem following that rule.