Well I got them all out (and didn't end up using penetrant). I think the previous owner used something on the plug threads which I understand is a bad idea.
New plugs in, all is good.
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2004 E320 4matic
2000 E320 wagon
-- in the past---
1992 190E 2.3 5-speed! (European Delivery Baby)
2000 ML320
1978 240D - 340k mi
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