McDonalds claiming there are no preservatives in their meat is like MuscleTech claiming their Creatine is 597% better than regular Creatine, lol.
Wrong. McDonalds is required by law to accurately state ingredients. With a little research on your part you will find that you are believing in nothing than lies you created in your head or heard repeated. There is no grand conspiracy, nothing hidden in McDonalds, no bad ingredients whatsoever.
Every item of McDonalds has been tested and retested and retested by nearly every single food lab including their own. There is nothing sinister here. Get a fucking clue.