It would still get up to temp, it would just take a really long time since all of the oil is flowing through the core. The thermostat should be preventing that, as it only allows a small amount of flow through the cooler until the oil hits 180 or so and the thermostat is fully open.
You're going to need to install a block off plate in the winter if you're at 190 degrees after the cooler in the summer. Overcooling the oil is almost just as bad as overheating it. There's a DIY here on how to make your own block off plate.
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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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