Picking up my 2005 18' center console on Wednesday and wondering if the 90hp Yamaha will be broken in. Is this common? If so, I won't have to pre-mix oil in gas tank for the first 10 hours. <br /><br />Also, if i decide to get 4 stroke in future, will I have to get a new tank given the fact that oil was mixed in gas tank for the break-in period?