Is the 93 perf tune a 93 octane performance tune? Forgive my ignorance here. I only have 87, 89 & 91 octane fuel here. Does this void warranty?
Yes, 93 perf” is 93-octane performance in this instance. You can get other tunes for lower octane, I have an 87-octane tune as well, but I never use it, truck feels more responsive on the 93 tune to my butt dyno, which is good enough for me.
As far as the warranty goes, yes and no. Technically they have to prove that your modifications caused whatever failed, but if your engine lets go and they scan the computer and it shows it was tuned, I would expect Ford isn’t going to replace it. Some dealers are less concerned about it than others, as well. My dealer here is pretty lackadaisical about mods in regards to doing warranty work. They won’t “look” for a way to get out of doing something under warranty unless directed by Ford.