I have used Opti-2 for years now. It's a 100 to 1 non synthetic oil.

I ran it at a 100 to 1 for a year or so, but found my big saw developed more power at 75 to 1.

I assumed it was because of better ring seal.

I have never mixed it with alcohol, but it was reformulated to be used with gasohol.

It's suppose to be drawn to heat instead of repelled by it.

Opti makes a 4 cycle oil also that doubles the manufactors engine warrenty.