Hey guys just wondering wat would the best oil be to put into my 2003 zzr250

Hi,,it realy comes down to how much do you want to pay? you could use a good mineral based oil,,that is not expensive or you could go to a semi or full synthectic,that will cost more.

oil change should be done at every 5000km,,and in winter you can use 10w-40/ 10w-50 and in summer 20w-40/ 20w-50.

as long as you change the oil every 5000km and of course not using supermarket brand oil,,then the choice is up to you.