I had some rust bubbling where the soundproofing foam on the top of the fender arch rubs through and rusts. Seeing how VW was hurting from dieselgate and a mixed history of covering fender rust, I was pleasantly surprised when they covered it. This was on my 2006, and about 6 months away from the end of the 12 year rusty warranty. The reason I never pursued it earlier was because I thought the warranty had a mileage limit. In fact, for my 2006, it was unlimited miles. Pleasantly surprised.