http://www.mazdas247.com/forum/showthread.php?123850355-Tapping-Noise-in-engine-bay
Sometimes ya win, sometimes ya don't. The thing about the warranty is that you know the cost, and it is planned for. You have no IDEA what (if anything) is going to take a dump in the next 100K miles.
As my son found out.
BMW compact engine timing chain failed, engine repairs 800.
So he took out a warranty for his replacement car a Vauxhall Astra, a new engine was required, cost thousands to replace. Car also had a new gear box but that was replaced FOC by Vauxhall.
Am I feeling lucky with my CX-5? no so its either an extended warranty or a new car. With all four Nissans I never felt that they would let me down, and they didn't.