Originally Posted by Blue Flame

Differs from bike to bike a wee bit I think.

I have never had to top up between changes. The level does not drop.

Manual states
"Use a premium quality 4-stroke motor oil to ensure longer service

life of your motorcycle . Use only oils which are rated SF or
SG under the API service classification . The recommended viscosity

is SAE 1OW-40 ."

Oh aye and its the Castrol GTX semi-synthetic that i use (i think)