I did try some heat on two nuts; the two by the filter are hard to get to with a torch.
I'll try cutting into them next; I do remember a post about that... and the one about being able to repair the threads on the oil cooler (though I would like to find another cooler just in case). How do you repair the threads btw?
Thanks for the ideas.

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'85 300TD W123
'83 300D W123, Daughter's
'80 300SD W116