I know there are ford websites but why would I want to patronize one of those..anyway My father in law has a '04 F150. Recently the motor started making a tapping/knocking noise. He took it to the dealer and they said that iol changes have to be done using ford filters and oil only (I think jiffy lube did the last oil change on it). Is the dealer blowing smoke or is that for real? Are manufacturers going to start voiding warranties on vehicles if you use aftermarket oil filters?