I have just purchased a 1970 year model 9.5 HP Evinrude Sportwin motor model # 9022a. & was going to run it on premixed fuel straight from bowser, but a friend told me i should mix my own fuel because my motor, being old, should be run on leaded petrol & the premixed stuff is unleaded. Could someone please tell me if this is correct & tell me the correct fuel & oil to use & what the ratio is for this motor.I also would like to know from what year model can you start using the premixed fuel ?All advice will be appreciated.