Honestly, with a used 2009 you might be better off changing all the fluids. Maybe even plugs. That way you know that they've all been done and when. You never know what kind of care the previous owner took or didn't take.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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