DC says that if you don't run Mobil 1 your warranty will be voided...... I'm running Mobil 1

But I've been sold on Mobil 1 since I started running it in my Explorer 2 years ago. I was getting 18 mpg doing mostly interstate driving. First I changed to K&N air filter and my mileage went to just under 21 mpg. Then a changed to Mobil 1 from patrolium Quaker State and my mileage went to 23 mpg. That sold me.