My Duralast H6 AGM isn't holding a charge anymore after 4.5 years. The car had always felt weak starting since day 1 - you know, the feeling that the starter is strained? But it always turned over, just not as quickly as my X5. It gave me a scare on a few cold mornings. Decided to put in an Bosch H7 AGM today since Pep Boys is running a 25% off until the end of the month. WOW - the starter seemed so energized - No more slow, belaboring turning over! I am more than happy to sacrifice a bit of weight gain for the reassurance that it won't die on me on a cold day.
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