The oil isn't an EPA thing, it's a lubrication thing. Some engines require a higher ratio for lubrication.
I run a "one bottle for all" mix. Says it will cover all mixes between 32:1 to 50:1 IIRC. Been using it for a couple years now. I have Homelite, Poulan, Echo, Stihl and McColloch 2 cylcles. One of each. LOL. I didn't want to keep 3 different jugs of gas.
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