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      01-07-2021, 10:18 PM   #11
Jay1101
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Drives: 2007 335i
Join Date: Dec 2020
Location: Rockvilled, MD

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It ended up being the short plug installed on the radiator by default, I installed the O-ring from FCP and it still leaked so I checked the drain plug housing piece itself and it was the short one instead of the long. Didn't realize it could be that because on autozone it said it was for auto trans and everything came preinstalled. Should have checked before installing the radiator anyways, oops.