Battery run-down test is one of the Inspection I checks. Dealer recommended mine be done when it failed this test during the 150K Inspection service. I declined their $250 part and made a beeline for Autozone. DIY and $89 later I have a new battery with 84 month replacement warranty...

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"Asphalt is evil...it must be punished!"

85 M635, 89 Z1, 90 Z1, 91 850, 02 4.6is, 03 M3 Cabrio, 17 30-Jahre M3