A: If the pieces of equipment are 2 cycle engines then a 2 cycle oil is what you would need, as a 2 cycle engine mixes the fuel and oil. If you are unsure of whether the equipment has a 2 cycle engine, it would be best to speak with someone from the place you purchased the equipment from, or get in contact with the manufacturer, in this case Ryobi as you mentioned.
A: Ethanol Shield and Ethanol Shield 2-cycle oil are two different products. Ethanol Shield is a fuel stabilizer that has a blue label near the Mechanic in a Bottle product on the shelf. Ethanol Shield 2-cycle oil is for 2-cycle fuel mixing and not for use in other types of gas engines.
A: I am no petroleum engineer but i think you will be fine once its out of your tank - maybe top off as soon as you are at 3/4 tank for a month or so to dilute the additive. I would expect a little smoke for a while from exhaust. If really concerned you could always drain/evacuate the tank and go from there.
A: Depends on how much you put in. If it’s a little bit then I wouldn’t worry to much. Possibly will smoke a little from tail pipe. If you put a lot then you might consider pumping gas out and putting fresh in.
A: The easy way to do this is, take 128 Ounces which is what is in a gallon, and divide by what ratio you want. 25:1=128 Divided by 25 = 5.12 Oz Per Gallon "opg", More examples 32:1=128 Divided by 32 = 4 opg Or 50:1=128 Divided By 50 = 2.56 opg
A: What determines the type of oil is the engine. (2 cycles or 4 cycles). This oil is for 2-cycle engines. The container marks 2.6 oz for 1 gallon of gasoline. In your 25:1 case you would have to use 5.2 oz for each gallon of gasoline. Bring the oil to the 2.6 oz deposit mark in the gallon of gasoline and add 2.6 oz again in the gallon of gasoline, to obtain the 5.2
A: Yes, you can double up the amount to 5.2oz per gal for a 25:1 ratio.