Hi All:<br /><br />I've got a 2.5 HP Johnson manufactured from 1946-1949 and on it is a decal that says:<br /><br />"Mix thoroughly in a clean can 1/2 pint Mobiloil AF or Mobil Oil SAE Marine oil #4 or a high grade SAE No. 40 oil with each gallon of gasoline"<br /><br />So what oil should I use...