Most 4 stroke/cycle dirt bike are air cooled and do require a special oil with extra scuffguard protection sc/cg ratings and 40 sae weight not sure about 10-40 multigrades also depends on your climate higher lets say 50 sae for hot, over 85 degree temps but always try to refer to a manual but you probably don't have that's why your here
no make
There are many but i would suggest the Honda CRF70F, the best of its kind
Get a KTM
u can noramlly find out by looking at the vin # then searching it on a dirt bike site.
they make oil to petrol thats why the is dirt
ask them
What kind of an idiot are you? That seriously depends on what kind of freaking bike you have, STUPID!
Wawa unleaded.
4 stroke
Green my friend
Best to use two stroke oil. Mix it with the petrol, (I guess you know this)
yZ 450cc with a pro tapper pickin pocker is exhausht is what i started with in i was 13. i now ride a Kx 993cc its a bad bike and it flies.