Oh yeah, those three busted oil pan screws are actually longer than all the other ones. They run up through the upper oil pan's flange/lip, through a steel brace above that, and then there are washers and nuts on top which is why they wouldn't back out and broke off. They'll be easy enough to replace since you can get to the threads up top where the nuts are.

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- Greg -
1973 220D, The Prodigal Benz
1974 240D