An ooze of oil is entirely normal on all pushrod ST engines at idle.
As Dave Massey says, a sludge build-up over time with mineral oils is
inevitable, even with oil and filter changes at regular intervals.
I've always used a flushing oil annually and then stripped the rocker
shaft and its components, giving them a thorough wash in kero and
prodding copper wire through the
bleed holes. I still do this. I recently bought an external oil feed
and it silenced the valve train, so I removed it. I think most people
fit them in the mistaken belief that oil ooze and nominally clattery
valvegear isn't normal - and it is.
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