Hi Shelly, There's two types of mower oil, There's the oil for the sump (4 stroke mowers ONLY) and the 2 stroke grade is just two stroke oil (2 stroke mower ONLY) If you own a 2 stroke mower then yes you actually add the oil to the gas before you put it in the gas tank (25 to 1 ratio) but If you own a 4 stroke mower then you DON'T put the oil in the gas tank. There is (two) capes, 1 for the gas and the 2nd cap is there somewhere for the oil.... Have a look at the link below... CHEERS..
http://bpretail.bp.nl/australie/2_stroke_brochure.pdf
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