Had this same problem on a '90 300SE
I think the plugs had been changed before but no dielectric grease was used.
I wound up twisting the boots CCW since the plug wires were adhering to the screw-on electrical 'thingie'. Still, it was an agonizingly slow and tiring process to remove the 6 wires by unscrewing the thingie off the threaded post.
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