hallo, i´m drakos, i´m from greece and i bye a second hand tdm 850 last summer. now it´s time to make my first full servise and i want to know some things from the ´olders´. first.. what kind of oil should i use? regular 20/50 or something better like 10/40? second.. one day my red light (not stop light) stop working and the same with the small frond light. i check the fuses under the seat but everything ok! is there anywhere else fuses that i must check? and finaly it´s time to change tires and i´m thinking to put bigger rear tire (now it´s 150/70) is it right or i put the same again? thank you!