jclausen over on the 3 series engines spotted in my photo that my cylinder block bolt head was missing. Pelican parts has a pretty good writeup on it.
I've got some RTV sealant on that shallow depression until I get a replacement aluminum bolt, work the old one out, and install the new one. Crazy, right?
Two photos: one from my 2007 328i with the same n51 sulev engine and the bolt intact, and the other again from my leaking 2011 128i n51 with the missing bolt.
