I've been getting a steering wheel vibration (not from tires) that goes across rpm and speed ranges. The vibration is consistent across speeds. 140k and 10 years old, original mounts. Will one fail catastrophically if I don't repair beforehand? I SUSPECT mounts, but not sure. I just don't want one to break or something, and then I'm forced to tow it. I can't find a single thread on 202 mounts. Maybe they don' require replacement

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL