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Date registered: Jan 2006
Vehicle: About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
Location: Just west of Philly
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Quoted: 49 Post(s)
Yes, by all means get a brand new key from the dealer who can cut one to fit if you give him the VIN. I've done this with 3 W124s and each time the key has worked perfectly.
The lock cylinders do need lubrication but I never use liquid lubricants like WD-40, Blaster, etc. Liquid lubricants will work but they leave a wet residue that attracts and holds grit and dust. The long term view is not good. Instead, use a lock cylinder lubricant which is just a powdered graphite dust. Some brands come as a liquid that uses alcohol as the base. The alcohol evaporates quickly leaving only the graphite powder. Push the tip of the lubricant container into the key slot, forcing the door open. Squirt away. The cylinders on my 88 260E were marvelously improved using this method.
I don't know what your locksmith did but there is no adjustment of the lock cylinders. None.
To save wear and tear on my driver's door lock cylinder I use the trunk or passenger side whenever it makes sense. My wife likes it when I open the door for her anyway!