Don't add oil to the fuel tank, it doesn't mix well in there and you'll almost always use too much oil. Mix your two-cycle oil and petrol in a gas can to get a 50:1 mixture. Read the directions on the two-cycle oil bottle for how much to use and put the oil in the can first so the petrol will mix well with it as you add it to the can.
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Don't add oil to the fuel tank, it doesn't mix well in there and you'll almost always use too much oil. Mix your two-cycle oil and petrol in a gas can to get a 50:1 mixture. Read the directions on the two-cycle oil bottle for how much to use and put the oil in the can first so the petrol will mix well with it as you add it to the can.