Denver 'ilusmtm' Cook

Hi folks, Well here i am at 40 with my first bike, a yammy ybr 125. Never really thought about biking until my son, who turned 16 last year asked me to do the cbt with him for support. Here i am now with my full test booked in for the second week in april. My 125 has been great fun to learn on, but 8 months on, hitting 9k revs at 75mph is getting a touch annoying lol. Anyway, all things well i should be part exchanging next moth for something bigger. Attempting my first oil change tomorrow, i let the garage do the first one. Does anyone know how much oil i will need please? I know its 10w/40 just not sure of the amount, Kindest regards, Denver