oil and filter

i just did another oil/zinc search was on the mobil oil site you can ask ?'s there so i asked about zinc in oils the response was all motoroils still had zinc but that the mobil delvac heavyduty had the highest level of zinc so i asked if it was higher than shell they replied yes ya can check it out i know i still hadn't seen any facts every oil company has a differnt story there all the best just ask em