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I too is skeptical of the AGM in our Passats. But alas I just installed one from Costco as they only offered the H7 size in an AGM. I originally wanted to get an OE VW battery as my old one lasted 4 1/2 years. But my dealership doesn't stock the 80 ah (H7) battery my car needs. I have PTSD from leaking batteries on my other vehicles, and causing corrosion and rust through. Another reason I consider using an AGM. I've purchased several Duralast, Walmart and other flooded lead batteries in the past in my other vehicles, but they all leaked fumes and caused corrosion. I don't know how today's Duralast are built, but I would check your dealership for an OE battery.

And for my car, we'll see how this AGM holds up in my car.
 
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