This was the most expensive oil change ever. I decided to bring the car into a shop and they were able to chisel the nut loose. I went out and bought a vice wrench but that just stripped the nut even more, eventually I don't think any metal would have been left. Even the guys at the shop said the folks who previously changed the oil left everything very tight. I want to thank everybody for their input and help.

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1989 260E >105K
1980 450 SLC 22k