AutoZone Gold-Seal batteries all come with a very long warranty, but most importantly 36 month free replacement. I don't know how long they'll live in a Boxster, but in most front engine FWD cars, NOTHING lasts three years, so it's a lifetime of free replacement batteries. My Acura dealer turned me on to them.
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Sold - Black on Sand Beige 2006 S - 48K miles
18x8.5 and 10 OZ Alleggerita HLT Anthracite wheels and anthracite Cayman side grilles - lovingly adjusted Schnell Short Shift
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