Yes.Do all these "mods" you guys put on your brand - new trucks, void the warranty?
But I guess that also depends on how well you know the dealer. They can do a lot if they really want to.
I was denied a warranty claim for a rear end because of my oversize tires and lift.
I "assumed" it would be covered and brought it in for some metal pieces I found during a differential oil change but it turned out to be just some filings left over from the factory. Cost me $1200.
I've been asked if I have a KN filter and that may void the warraty if oil is on the mass air flow sensor.
Whether they can legally do it or not, it can be a hassle and not worth going to court.