I have 4 cars at home and have been using Autozone Duralast batteries for the last 10 years but here are my gripe:

- Prices for Duralast battery keeps going up and up and up...Now it is about $130, $140 etc.

- They last only about 2-3 years for me, and fail almost like clockwork.

- Autozone warranty is only 2y now, no more pro-rated thingy.

So, time for me to look at alternative. I was at local Menards hardware store.
Found Exide L3/48X battery for $94, with 40-month warranty.
It fits the 1998 Volvo S70 battery tray perfectly.
Since the 1998 Volvo S70 and the 2006 X5 3.0 use the same battery, this should fit the X5 3.0.

So, this is what I use now, time will tell how long The Exide battery lasts.




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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT