Replace the cylinder before it freezes completely. Lots of threads on the forum, use the search function. You don't want to know what it takes to do the repair of a stuck key or frozen cylinder. Your dealer can get you a new cylinder and key, matched to what originally came from the factory. You will need your VIN and proof of ownership. Do it NOW!

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970