You did well.

Mine actually gave me fair warning around a month or so before giving up the ghost.

The OEMs (on the W163 and the R129) lasted around six years before dying. The W124 is the daily driver, and it usually eats a battery every three years.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car