Almost 99% of the times I visit the dealership, they recommend replacing some expensive part instead of fixing the errant component within.

They once quoted $750 for replacing the steering pump on my W124 for a leaking problem when in fact, my indie solved it with about $15 worth of a seal kit...

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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