Just got an oil change with the Mobil 7500 (figured give it a shot) and the guy told me he accidentally poured an extra 1/4 of a quart in. He told me it won't hurt the engine any, is this true or will it hurt my engine? I've driven it around town this morning and nothing is different but want to be sure I don't need to go back and get it all drained out and waste more of my day off.