That's not correct. That would be the case if you have a shady dealer or only one dealer nearby. Legally, dealers and manufacturers aren't allowed to deny claims unless it can be proven maintenance wasn't done or poor workmanship caused the value of a warranted part. The key is to make sure you have documented evidence all services were done on time.
I haven't done enough research on this yet, but, it's my understanding there are certain "inspection" intervals that have to occur at dealers to maintain the lifetime warranty. I don't know all the details on that yet.
All that said, unless you're doing the maintenance yourself, I've found dealers here in NJ aren't that much more expensive than local technicians. I almost always have my vehicles services at a dealer. This, obviously, may not be the case where you live.
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