Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6.7l
Location: Vegas MAN, Vegas
Mentioned: 10 Post(s)
Quoted: 1289 Post(s)
You might be the first one that is having the problem on ML, but I had that unpleasant experience on older E class that still had blade key.
Spray lot of WD40 inside the tumbler and keep inserting and removing the key several times wiping it off between. It helped me for almost a year.
Replacing the ignition tumbler might be an easy part, but you will have different key blade for the doors.
$170 sound really cheap even if the tumbler cost less than $100.
MB has very tricky steering wheel blockade and any tampering ends in permanent lock, that require cutting and getting new blockade mechanism. You can read more about mine and other experience in W210 section.