Seafoam made my old beater Volvo run noticeably smoother, but that was a car that was well over 200k miles and the previous owners did not maintain the car all that well. When I used it on newer cars, all I noticed was my wallet was $8 lighter.
According to Bob Is The Oil Guy, Techron is really the best readily available fuel treatment. The rest do very little.
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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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