I had a 5.4 v3, 800 CAD for a plug change because they liked to break, that was assuming the plugs hadn't self ejected. You may not have noticed the noise of a missing spark plug over the cam phaser knock, the primary cat self destructed knock or just the general noise of the cooling fan clutch which took an hour to disengage at -30c
So yeah once Ford sorted all that out, they became reliable which was just about the time they decided to make them obsolete.
So yeah once Ford sorted all that out, they became reliable which was just about the time they decided to make them obsolete.