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FOLLOW UP
UPDATE:
I got the Staton cooling system pressure tester (with BMW adapter) and it worked beautifully. Much to my utter disappointment, it helped me determine that indeed my valley pan cover was leaking AGAIN. I made the mistake of using RTV Black gasket to make my own gasket for the original valley pan cover. Perhaps not such a bad idea, but you really have to get it on there just right, and more importantly let it set up properly before you install it. I don't think I got the cover back on there right and/or it was too cold (40 F or so) so the RTV never got a chance to cure before I ran the vehicle. Lesson learned.
I'm back in there, and will be installing a factory BMW valley pan cover with gasket. I'll be using a torque wrench this time too. Wish me luck...
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