After twenty years of locksmithing in western NY, I use
assortment of lock lubes. For car door and trunk locks, I do
use 10w30. If car door locks aren't lubricated regularly,
they sieze up, and become a worthless lump of zinc.

Different lubes for other reasons. Including silicone,
graphite, and the old WD.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
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wrote in message
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Please no WD-40! Use oil instead.

Oil is not good for locks as it attracts dust and grit.
WD-40 is not
perfect, but it is better for flushing out locks than
heavier oil.