Question:

Do you encourage the usage of the KJV exclusively?

Answer:

No. The reason for this is the knowledge that languages change over time. The King James Version has become outdated for that reason and for the reason that archeologists have discovered ancient manuscripts of the Bible which are much older than those available in 1611 when the KJV was first published.

It is true that some Presbyterian churches have clung to the KJV out of the belief that the Greek texts from which the KJV were translated are supposed to be purer than the earlier manuscripts discovered since then. But this view is not widely held in the OPC.