I do not know of anyone using 10:1 or 12:1 at this time, so that is moot.



32:1 is essentially 3% oil ... 25:1 is 4% oil ... 50:1 is 2% oil .... the difference between 4% and 2% is virtually undetectable in both mixture strength for fuel/air and pouring viscosity

TRY IT and see, DON'T just guess or assume