Non factory issued keys are not good for your lock cylinders they wear out easily. Brass keys.. You need steel keys to work better. Also one more thing the locksmith cut keys are not as precise as the Factory issued ones..

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'76 300D
'82 230CE
'84 300DT
'91 300D 2.5
'86 300D 5 speed
'86 250D 5 speed
'90 300E 24v
'88 560SEC
300TE euro 5 speed
91 350SD
http://i75.photobucket.com/albums/i3...d6605222-1.jpg