I believe that in the owner's manual for the 2001 CLK 55, there is a recommended break-in period of 1000 miles. Check the owner's manual, it will probably mention something about it.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record