I waited until 6k miles to swap to synthetic, but that's probably overkill. Any good quality full synthetic of the appropriate weight is fine to use. The capacity is in the manual, which it seems like you haven't read. Read it.
And Turtle Wax is garbage. Go into the detailing forum and do some reading there.
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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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