Volkswagen TRANSPORTER 1963 Instruction Manual page 39

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DOORS AND LOCKS
The door lock striker plates should be very lightly greased. Apply
a few drops
of oil to the lid hinges. The door hinges should be oiled at every lubrication
service or, better still, once a week after dust and dirt has been removed.
Door cylinder locks should be treated with graphite. Dip the key into the
graphite, insert key and move it back and forth several times.
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