The first dead MAF will be the person that over-oils the filter after cleaning, installs it and takes off. If you use the recommended amount of oil it should never be a problem. But, just for a little insurance, I always let mine sit for a day or two after oiling (wrapped in newspaper) to make sure that there is no excess oil to coat the MAF. Have used this procedure for more years than I care to count, and I have never had a problem.