CSF Radiators 3718: Radiator, BMW

Installed in a 2011 328i, fit looks good and the quality of the radiator seems to be decent, however, I cannot get the plug to stop leaking. I have tried two additional new plugs, but the housing must have a flaw because it will not stop. Completely drains the radiator in about 15 minutes. I am past the Amazon return window, so I will contact the manufacturer and update with what they say.

Very disappointing CSF! What first appears to be a great radiator for the N51, isnt. As others have said, the problem is at the drain plug - it leaks!! And you dont find out until you remove your old one and complete the install of the new one. Seems to leak where the O-rings interface the bore of the end tank. Do yourself a favor and buy the BMW version - buy once and cry once (I wish I would have)!

Installed in an 09 328i xdrive. The fit was extremely tight, making us have to really work it into place. The fitting for the upper radiator hose has a defect where one side of the lock spring would not lock in and would cause the hose to cock sideways and leak (even with a new oring). Had to file away a little plastic in order for the lock spring to fit in its slot. Other than that, pressure tested per bmw to 29 psi without issue. Seems good quality and closer to the factory unit than the Mahle/Behr unit it replaced. The Mahle/Behr unit lasted 1 year 7k miles and started leaking at both sides where the plastic tanks seal against the aluminum radiator. Csf should be an upgrade.