Yeah but its a common problem on those long neck wheel bolts, which is why MB no longer makes them.

We have a 4 ft bar specifically for this problem, the last one I had, 18 of the 20 bolts were seized. Put the bar on the bolt, apply some torque, just enough to tension it and using a sledge hammer, pound on the end of the bar, square with the bolt head. after a few knocks, the bolt will start to turn with out the bolt breaking. It also works on bent lug bolts.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350