ive used the steering wheel lock with no problems on several 201s and 124s many times. If you take a second to look at your ignition lock assembly, you will notice that MB spared no expense to ensure that these cars would be hard as hell to steal. The internals of the lock assembly are made of very hard metals, and do not break very easy. My only concern would be jamming your ignition lock, but im pretty sure they are unrelated.

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1993 2.6 (040) SportLinE 5-speed - Armed to the teeth w. roof rack/2x bike carriers/8x ski carriers/MB towing bumper
1993 2.6 (040) - deceased/reincarnated as a trailer.
1987 16v (702) - Now parting out(9/22/10)!!! - Email me your requests for 16v parts- Engine and full body kit avail!!
1987 300SDL (122)- For sale!