Mine's not a SC, but I clean and lube the BOVs every time I have the bumper off to clean the air filters. Turbosmart makes a BOV specific lube.
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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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