I was waiting for somebody to pipe in about the Optima battery, and sure enough somebody did. :D
In my opinion I don't think that a dealer would put in this OVERPRICED battery! Besides, I got 6 years of excellent service from the Diehard Gold before it crapped out. I think that it would have lasted longer, but somebody in the carwash that I went to flipped the dome light switch into the 'ON' position. I didn't use the car for 2 weeks after that so it deep discharged the battery and it was stone dead. I was able to charge it, but I think that this caused the battery plates to sulfide enough to shorten it's useful life.
One other thing......I have heard plenty of horror stories concerning the Optima line of batteries, both yellow or red types. <_<