You will be better served to go with the reman unit. Better warranty(any dealer) & much better quality workmanship than any dealer tech can do. The factory reman gets any & all parts replaced that show wear.
If nesessary pay a little extra & get the best value for your $$$$.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS M.B. TECH