Two Choices:

MB has a door lock cylinder (Leafs in MB's case) specific spray Lube.

Local locksmith recommends Straight Silicone Spray Only.
"Stick that little tube in the door lock."

The Wunnerful thing about spray Silicone IS, in the Dead of Winter,
with FROZEN locks... The Spray allows you to free them up with
gloves on!

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"Zome" say that Graphite, in any form, is an abrasive.

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'84 300SD sold
124.128