On my 99 e300. Apparently the person before me cranked one particular one down as tight as the impact would go. The head is already angling up as I was trying to break it lose with a breaker bar. If the head twists off, will I still be able to get the wheel off (the other 4 lugs are fine) or is there something in the design of this lug stud that's going to cause it to stick? I have a magnetic induction heater if I can just get the wheel off. I'm guessing this is probably best left to a shop that can just weld a nut in place on the end and try to get it out that way?

This happened to me once when I used a too-long bar to torque my lug bolts and went too far.

You won't be able to get the wheel off but the solution is simple and quick:

1.) Get an Easy-Out bolt remover kit
2.) Get a cobalt or black oxide drill bit

If/when the head twists off, drill a hole in the remnant of the bolt and tap the Easy-Out into it. Then use your breaker bar and appropriately-sized socket to crank out the bolt.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

Slide a "cheater bar" over your breaker bar for extra leverage. While applying steady pressure to loosen the bolt, have a helper strike the back of the breaker bar, driving the socket into the bolt hole. I've never had this method fail and I've done it a lot.

I saw several which had the head twisted in half and left the shoulder bonded to the wheel. Saw two of those in Greer LKQ yesterday.

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84 300SD
85 380SE
83 528e
95 318ic