No mods void your warranty. If the part causes a failure, that particular claim may be denied. A quality oil cooler installed properly will not cause you problems.
The old oil that stays in the core is nothing to worry about.
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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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