I had Opti here and cross examined it against another oil that was for 50 to 1. I live at a very high elevation. So having to re-jet carbs is of course a given no matter what. I compared to my 50 to one oil and guess what.......... the Opti was very unmistakably thicker . This just means it is thicker oil. ''The oil is clearly thicker in viscosity''
Every body is still mixing oil the same way lol.
100 to one 50 to one 30 to one. Ah smellgha Water down some bearing grease . ''Just Kidding''