You know what? I feel sorry for Barrie. Just bought a small outboard and wants to know the oil ratio, presumably to know how to run and maintain it correctly. My Journeyman worked with outboards for 20 years and was a Yamaha field engineer. I've been either paid to look after outboards or worked on them as a hobby for 30 years. 50 years of combined experience with outboards and millions of Yen spent developing them and providing instruction manuals and user manuals and still there are some who think it's all claptrap. I used to look after a fleet of 150 Yamaha Outboards used in the North Sea! Ive seen the people responsible for fuelling them under oil them and blow them up. Ive seen people over oil them and coke them up. Ive seen what happens when someone premixed diesel and oil by accident. Ive never seen one destroyed by following the manufacturers recommended oil quality and ratios. Ive seen a lot of people pay a fortune to have them repaired by doing exactly what it says not to do! The manual tells you what happens if you do the wrong thing. Rofl, Bolt, Thumbs, smiley face, whatever!