I always said I wouldn't delete our F250 and 350 until the systems caused me issues. The F250 did it about a year ago, was $1000 to delete it or $1500-$3k to fix it, so its deleted. Runs very well now and picked up 2mgs as well in city driving. Were in OK so lot of deleted trucks here and most dealers don't seem to care one bit. I've seen newer models on their used lots that are deleted.