I had the water pump replaced on my 300E by the dealer about a month ago, after discovering the leak at that component. Drove it home that evening and discovered the same amount of leakage the next morning! Turned out that they did not torque down the water pump the first time.

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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