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Mercedes 2009 C300 4 matic. What damage could I have done…

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Mercedes 2009 C300 4 matic...
Mercedes 2009 C300 4 matic. What damage could I have done driving in D1 for an extended period? The car now sounds quite loud.
Submitted: 2 years ago.Category: Mercedes
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Answered in 2 minutes by:
3/5/2016
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,253
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
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Hello you should not have done any damage because if the engine RPMs exceed a certain limit the car will actually upshift for you. How far and how long did you drive in D1 ?

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