i'm running a sears die hard gold as well installed by the previous owner. i have no idea how old it is but it works great. in my benz i always ran the sears die hard int'l group 49 battery. as you are aware no doubt they are one big **** battery.

as a replacement though, my point is that you can get a better warranty and a cheaper price for the EXACT same battery made by johnson controls at autozone.