I recently had to take my car in to get the diff seals fixed, which meant the diff had to be removed from the car. I was a little worried that they would try and void doing it under warranty as the car is lowered with 20's and has a BOV, even though these items have no relevance to the leaking diff, but they didn't say anything. 1 thing that pissed me off is that Ford wont pay all the expanses for a hire car if they are fixing something ever a claim under warranty, so if they were to take 1 week to fix the car you would need to pay the insurance for that week for the hire car. I want to get just the tune done on my car for now, but since they ca apparently now check the number of ecu flashes another risk of voiding warrant if some of their sh*te engineering falls apart on the car in the future.